Pub Date : 2023-05-11DOI: 10.1021/acsorginorgau.3c00010
Marissa L. Clapson, David J. Nelson* and Marcus W. Drover*,
Monodentate phosphine-ligated nickel compounds, e.g., [Ni(PPh3)4] are relevant as active catalysts across a broad range of reactions. This report expands upon the coordination chemistry of this family, offering the reactivity of allyl- and vinyl-substituted diphenylphosphine (PPh2R) with [Ni(COD)2] (COD = 1,5-cyclooctadiene). These reactions provide three-coordinate dinickelacycles that are intermolecularly tethered through adjacent {Ni}-olefin interactions. The ring conformation of such cycles has been studied in the solid-state and using theoretical calculations. Here, a difference in reaction outcome is linked to the presence of an allyl vs vinyl group, where the former is observed to undergo rearrangement, bringing about challenges in clean product isolation.
{"title":"Nickel Complexes of Allyl and Vinyldiphenylphosphine","authors":"Marissa L. Clapson, David J. Nelson* and Marcus W. Drover*, ","doi":"10.1021/acsorginorgau.3c00010","DOIUrl":"10.1021/acsorginorgau.3c00010","url":null,"abstract":"<p >Monodentate phosphine-ligated nickel compounds, <i>e.g.</i>, [Ni(PPh<sub>3</sub>)<sub>4</sub>] are relevant as active catalysts across a broad range of reactions. This report expands upon the coordination chemistry of this family, offering the reactivity of allyl- and vinyl-substituted diphenylphosphine (PPh<sub>2</sub>R) with [Ni(COD)<sub>2</sub>] (COD = 1,5-cyclooctadiene). These reactions provide three-coordinate dinickelacycles that are intermolecularly tethered through adjacent {Ni}-olefin interactions. The ring conformation of such cycles has been studied in the solid-state and using theoretical calculations. Here, a difference in reaction outcome is linked to the presence of an allyl vs vinyl group, where the former is observed to undergo rearrangement, bringing about challenges in clean product isolation.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/71/6b/gg3c00010.PMC10401672.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9954819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-09DOI: 10.1021/acsorginorgau.3c00012
Rawiyah Alkahtani, and , Thomas Wirth*,
A family of chiral iodoaniline-lactate based catalysts with C1 and C2 symmetry were efficiently synthesized. Comparisons between the reactivity and selectivity between the new and previously reported catalysts are made. The new catalysts promoted the α-oxysulfonylation of ketones in shorter reaction times and with higher yields of up to 99%. A scope for the oxysulfonylation reaction is presented, forming a variety of reported and novel products with enantioselectivities of up to 83%.
{"title":"Synthesis of Chiral Iodoaniline-Lactate Based Catalysts for the α-Functionalization of Ketones","authors":"Rawiyah Alkahtani, and , Thomas Wirth*, ","doi":"10.1021/acsorginorgau.3c00012","DOIUrl":"10.1021/acsorginorgau.3c00012","url":null,"abstract":"<p >A family of chiral iodoaniline-lactate based catalysts with <i>C</i><sub>1</sub> and <i>C</i><sub>2</sub> symmetry were efficiently synthesized. Comparisons between the reactivity and selectivity between the new and previously reported catalysts are made. The new catalysts promoted the α-oxysulfonylation of ketones in shorter reaction times and with higher yields of up to 99%. A scope for the oxysulfonylation reaction is presented, forming a variety of reported and novel products with enantioselectivities of up to 83%.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.3c00012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9954822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-03DOI: 10.1021/acsorginorgau.3c00005
Tobias Bens, Jasmin A. Kübler, Robert R. M. Walter, Julia Beerhues, Oliver S. Wenger and Biprajit Sarkar*,
We present here new synthetic strategies for the isolation of a series of Ru(II) complexes with pyridyl-mesoionic carbene ligands (MIC) of the 1,2,3-triazole-5-ylidene type, in which the bpy ligands (bpy = 2,2′-bipyridine) of the archetypical [Ru(bpy)3]2+ have been successively replaced by one, two, or three pyridyl-MIC ligands. Three new complexes have been isolated and investigated via NMR spectroscopy and single-crystal X-ray diffraction analysis. The incorporation of one MIC unit shifts the potential of the metal-centered oxidation about 160 mV to more cathodic potential in cyclic voltammetry, demonstrating the extraordinary σ-donor ability of the pyridyl-MIC ligand, while the π-acceptor capacities are dominated by the bpy ligand, as indicated by electron paramagnetic resonance spectroelectrochemistry (EPR-SEC). The replacement of all bpy ligands by the pyridyl-MIC ligand results in an anoidic shift of the ligand-centered reduction by 390 mV compared to the well-established [Ru(bpy)3]2+ complex. In addition, UV/vis/NIR-SEC in combination with theoretical calculations provided detailed insights into the electronic structures of the respective redox states, taking into account the total number of pyridyl-MIC ligands incorporated in the Ru(II) complexes. The luminescence quantum yield and lifetimes were determined by time-resolved absorption and emission spectroscopy. An estimation of the excited state redox potentials conclusively showed that the pyridyl-MIC ligand can tune the photoredox activity of the isolated complexes to stronger photoreductants. These observations can provide new strategies for the design of photocatalysts and photosensitizers based on MICs.
{"title":"Impact of Bidentate Pyridyl-Mesoionic Carbene Ligands: Structural, (Spectro)Electrochemical, Photophysical, and Theoretical Investigations on Ruthenium(II) Complexes","authors":"Tobias Bens, Jasmin A. Kübler, Robert R. M. Walter, Julia Beerhues, Oliver S. Wenger and Biprajit Sarkar*, ","doi":"10.1021/acsorginorgau.3c00005","DOIUrl":"10.1021/acsorginorgau.3c00005","url":null,"abstract":"<p >We present here new synthetic strategies for the isolation of a series of Ru(II) complexes with pyridyl-mesoionic carbene ligands (MIC) of the 1,2,3-triazole-5-ylidene type, in which the bpy ligands (bpy = 2,2′-bipyridine) of the archetypical [Ru(bpy)<sub>3</sub>]<sup>2+</sup> have been successively replaced by one, two, or three pyridyl-MIC ligands. Three new complexes have been isolated and investigated via NMR spectroscopy and single-crystal X-ray diffraction analysis. The incorporation of one MIC unit shifts the potential of the metal-centered oxidation about 160 mV to more cathodic potential in cyclic voltammetry, demonstrating the extraordinary σ-donor ability of the pyridyl-MIC ligand, while the π-acceptor capacities are dominated by the bpy ligand, as indicated by electron paramagnetic resonance spectroelectrochemistry (EPR-SEC). The replacement of all bpy ligands by the pyridyl-MIC ligand results in an anoidic shift of the ligand-centered reduction by 390 mV compared to the well-established [Ru(bpy)<sub>3</sub>]<sup>2+</sup> complex. In addition, UV/vis/NIR-SEC in combination with theoretical calculations provided detailed insights into the electronic structures of the respective redox states, taking into account the total number of pyridyl-MIC ligands incorporated in the Ru(II) complexes. The luminescence quantum yield and lifetimes were determined by time-resolved absorption and emission spectroscopy. An estimation of the excited state redox potentials conclusively showed that the pyridyl-MIC ligand can tune the photoredox activity of the isolated complexes to stronger photoreductants. These observations can provide new strategies for the design of photocatalysts and photosensitizers based on MICs.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.3c00005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9949065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-02DOI: 10.1021/acsorginorgau.3c00006
Batoul Almoussawi, Hiroshi Kageyama, Pascal Roussel and Houria Kabbour*,
Oxychalcogenides are emerging as promising alternative candidates for a variety of applications including for energy. Only few phases among them show the presence of Q–Q bonds (Q = chalcogenide anion) while they drastically alter the electronic structure and allow further structural flexibility. Four original oxy(poly)chalcogenide compounds in the system Ba–V–Q–O (Q = S, Se) were synthesized, characterized, and studied using density functional theory (DFT). The new structure type found for Ba7V2O2S13, which can be written as Ba7S(VS3O)2(S2)3, was substituted to yield three selenide derivatives Ba7V2O2S9.304Se3.696, Ba7V2O2S7.15Se5.85, and Ba7V2O2S6.85Se6.15. They represent original multiple-anion lattices and first members in the system Ba–V–Se–S–O. They exhibit in the first layer heteroleptic tetrahedra V5+S3O and isolated Q2– anions and in the second layer dichalcogenide pairs (Q2)2– with Q = S or Se. Selenide derivatives were attempted by targeting the selective substitution of isolated Q2– or (Q2)2– (in distinct layers) or both by selenide, but it systematically led to concomitant and partial substitution of both sites. A DFT meta-GGA study showed that selective substitution yields local constraints due to rigid VO3S and pairs. Experimentally, incorporation of selenide in both layers avoids geometrical mismatch and constraints. In such systems, we show that the interplay between the O/S anionic ratio around V5+, together with the presence/nature of the dichalcogenides (Q2)2– and isolated Q2–, impacts in unique manners the band gap and provides a rich background to tune the band gap and the symmetry.
{"title":"Versatile Interplay of Chalcogenide and Dichalcogenide Anions in the Thiovanadate Ba7S(VS3O)2(S2)3 and Its Selenide Derivatives: Elaboration and DFT Meta-GGA Study","authors":"Batoul Almoussawi, Hiroshi Kageyama, Pascal Roussel and Houria Kabbour*, ","doi":"10.1021/acsorginorgau.3c00006","DOIUrl":"https://doi.org/10.1021/acsorginorgau.3c00006","url":null,"abstract":"<p >Oxychalcogenides are emerging as promising alternative candidates for a variety of applications including for energy. Only few phases among them show the presence of Q–Q bonds (Q = chalcogenide anion) while they drastically alter the electronic structure and allow further structural flexibility. Four original oxy(poly)chalcogenide compounds in the system Ba–V–Q–O (Q = S, Se) were synthesized, characterized, and studied using density functional theory (DFT). The new structure type found for Ba<sub>7</sub>V<sub>2</sub>O<sub>2</sub>S<sub>13</sub>, which can be written as Ba<sub>7</sub>S(VS<sub>3</sub>O)<sub>2</sub>(S<sub>2</sub>)<sub>3</sub>, was substituted to yield three selenide derivatives Ba<sub>7</sub>V<sub>2</sub>O<sub>2</sub>S<sub>9.304</sub>Se<sub>3.696</sub>, Ba<sub>7</sub>V<sub>2</sub>O<sub>2</sub>S<sub>7.15</sub>Se<sub>5.85</sub>, and Ba<sub>7</sub>V<sub>2</sub>O<sub>2</sub>S<sub>6.85</sub>Se<sub>6.15</sub>. They represent original multiple-anion lattices and first members in the system Ba–V–Se–S–O. They exhibit in the first layer heteroleptic tetrahedra V<sup>5+</sup>S<sub>3</sub>O and isolated Q<sup>2–</sup> anions and in the second layer dichalcogenide pairs (Q<sub>2</sub>)<sup>2–</sup> with Q = S or Se. Selenide derivatives were attempted by targeting the selective substitution of isolated Q<sup>2–</sup> or (Q<sub>2</sub>)<sup>2–</sup> (in distinct layers) or both by selenide, but it systematically led to concomitant and partial substitution of both sites. A DFT meta-GGA study showed that selective substitution yields local constraints due to rigid VO<sub>3</sub>S and pairs. Experimentally, incorporation of selenide in both layers avoids geometrical mismatch and constraints. In such systems, we show that the interplay between the O/S anionic ratio around V<sup>5+</sup>, together with the presence/nature of the dichalcogenides (Q<sub>2</sub>)<sup>2–</sup> and isolated Q<sup>2–</sup>, impacts in unique manners the band gap and provides a rich background to tune the band gap and the symmetry.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.3c00006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49768487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-20DOI: 10.1021/acsorginorgau.3c00001
Fenglou Ni, Thomas Richards, Louise R. Smith, David J. Morgan, Thomas E. Davies, Richard J. Lewis* and Graham J. Hutchings*,
The selective oxidation of methane to methanol, using H2O2 generated in situ from the elements, has been investigated using a series of ZSM-5-supported AuPd catalysts of varying elemental composition, prepared via a deposition precipitation protocol. The alloying of Pd with Au was found to offer significantly improved efficacy, compared to that observed over monometallic analogues. Complementary studies into catalytic performance toward the direct synthesis and subsequent degradation of H2O2, under idealized conditions, indicate that methane oxidation efficacy is not directly related to H2O2 production rates, and it is considered that the known ability of Au to promote the release of reactive oxygen species is the underlying cause for the improved performance of the bimetallic catalysts.
{"title":"Selective Oxidation of Methane to Methanol via In Situ H2O2 Synthesis","authors":"Fenglou Ni, Thomas Richards, Louise R. Smith, David J. Morgan, Thomas E. Davies, Richard J. Lewis* and Graham J. Hutchings*, ","doi":"10.1021/acsorginorgau.3c00001","DOIUrl":"https://doi.org/10.1021/acsorginorgau.3c00001","url":null,"abstract":"<p >The selective oxidation of methane to methanol, using H<sub>2</sub>O<sub>2</sub> generated in situ from the elements, has been investigated using a series of ZSM-5-supported AuPd catalysts of varying elemental composition, prepared via a deposition precipitation protocol. The alloying of Pd with Au was found to offer significantly improved efficacy, compared to that observed over monometallic analogues. Complementary studies into catalytic performance toward the direct synthesis and subsequent degradation of H<sub>2</sub>O<sub>2</sub>, under idealized conditions, indicate that methane oxidation efficacy is not directly related to H<sub>2</sub>O<sub>2</sub> production rates, and it is considered that the known ability of Au to promote the release of reactive oxygen species is the underlying cause for the improved performance of the bimetallic catalysts.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.3c00001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49767804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-27DOI: 10.1021/acsorginorgau.3c00008
Ludivine Delfau, Nadhrata Assani, Samantha Nichilo, Jacques Pecaut, Christian Philouze, Julie Broggi, David Martin* and Eder Tomás-Mendivil*,
We report the isolation and study of dimers stemming from popular thiazol-2-ylidene organocatalysts. The model featuring 2,6-di(isopropyl)phenyl (Dipp) N-substituents was found to be a stronger reducing agent (Eox = −0.8 V vs SCE) than bis(thiazol-2-ylidenes) previously studied in the literature. In addition, a remarkable potential gap between the first and second oxidation of the dimer also allows for the isolation of the corresponding air-persistent radical cation. The latter is an unexpected efficient promoter of the radical transformation of α-bromoamides into oxindoles.
我们报道了从流行的噻唑-2-亚基有机催化剂中分离和研究二聚体。以2,6-二(异丙基)苯基(Dip)N-取代基为特征的模型被发现是比文献中先前研究的双(噻唑-2-亚基)更强的还原剂(Eox=−0.8 V vs SCE)。此外,二聚体的第一次和第二次氧化之间的显著电势差也允许分离相应的空气持久性自由基阳离子。后者是α-溴酰胺自由基转化为羟吲哚的出乎意料的有效促进剂。
{"title":"On the Redox Properties of the Dimers of Thiazol-2-ylidenes That Are Relevant for Radical Catalysis","authors":"Ludivine Delfau, Nadhrata Assani, Samantha Nichilo, Jacques Pecaut, Christian Philouze, Julie Broggi, David Martin* and Eder Tomás-Mendivil*, ","doi":"10.1021/acsorginorgau.3c00008","DOIUrl":"10.1021/acsorginorgau.3c00008","url":null,"abstract":"<p >We report the isolation and study of dimers stemming from popular thiazol-2-ylidene organocatalysts. The model featuring 2,6-di(isopropyl)phenyl (Dipp) N-substituents was found to be a stronger reducing agent (<i>E</i><sub>ox</sub> = −0.8 V vs SCE) than bis(thiazol-2-ylidenes) previously studied in the literature. In addition, a remarkable potential gap between the first and second oxidation of the dimer also allows for the isolation of the corresponding air-persistent radical cation. The latter is an unexpected efficient promoter of the radical transformation of α-bromoamides into oxindoles.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/89/cf/gg3c00008.PMC10251502.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9622731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-20DOI: 10.1021/acsorginorgau.3c00009
Shelley Minteer, Jingguang Chen, Song Lin, Cathleen Crudden, Stefanie Dehnen, Prashant V. Kamat, Marisa Kozlowski, Géraldine Masson and Scott J. Miller,
{"title":"New Guidelines for Presenting Electrochemical Data in All ACS Journals","authors":"Shelley Minteer, Jingguang Chen, Song Lin, Cathleen Crudden, Stefanie Dehnen, Prashant V. Kamat, Marisa Kozlowski, Géraldine Masson and Scott J. Miller, ","doi":"10.1021/acsorginorgau.3c00009","DOIUrl":"10.1021/acsorginorgau.3c00009","url":null,"abstract":"","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a3/54/gg3c00009.PMC10080720.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9264531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-08DOI: 10.1021/acsorginorgau.2c00061
Yanis Lazib, Junio Guimaraes Naves, Agnès Labande, Philippe Dauban* and Tanguy Saget*,
C2-Symmetrical scaffolds are privileged ligands in metal catalysis and are also widely used in organocatalysis. Among these, 2,5-disubstituted pyrrolidines hold a paramount importance, especially since they also find application in medicinal chemistry. This review highlights the stereoselective syntheses of these C2-symmetrical nitrogen heterocycles. It includes synthetic strategies based on the use of the chiral pool as well as the more recent sequences designed following major achievements in asymmetric catalysis.
{"title":"Asymmetric Syntheses of Enantioenriched 2,5-Disubstituted Pyrrolidines","authors":"Yanis Lazib, Junio Guimaraes Naves, Agnès Labande, Philippe Dauban* and Tanguy Saget*, ","doi":"10.1021/acsorginorgau.2c00061","DOIUrl":"10.1021/acsorginorgau.2c00061","url":null,"abstract":"<p ><i>C</i><sub>2</sub>-Symmetrical scaffolds are privileged ligands in metal catalysis and are also widely used in organocatalysis. Among these, 2,5-disubstituted pyrrolidines hold a paramount importance, especially since they also find application in medicinal chemistry. This review highlights the stereoselective syntheses of these <i>C</i><sub>2</sub>-symmetrical nitrogen heterocycles. It includes synthetic strategies based on the use of the chiral pool as well as the more recent sequences designed following major achievements in asymmetric catalysis.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/7f/c8/gg2c00061.PMC10251504.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9617073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-02DOI: 10.1021/acsorginorgau.2c00055
Valentin Quint, Thi Hong Van Nguyen, Gary Mathieu, Saloua Chelli, Martin Breugst*, Jean-François Lohier, Annie-Claude Gaumont and Sami Lakhdar*,
Regioselective phosphonation of pyridines is an interesting transformation in synthesis and medicinal chemistry. We report herein a metal-free approach enabling access to various 4-phosphonated pyridines. The method consists of simply activating the pyridine ring with a Lewis acid (BF3·OEt2) to facilitate the nucleophilic addition of a phosphine oxide anion. The formed sigma complex is subsequently oxidized with an organic oxidant (chloranil) to yield the desired adducts in good to excellent yields. We furthermore showed that access to C2-phosphoinated pyridines can be achieved in certain cases with strong Lewis basic phosphorus nucleophiles or with strong Lewis acidic pyridines. Both experimental and computational mechanistic investigations were undertaken and allowed us to understand the factors controlling the reactivity and selectivity of this reaction.
{"title":"Transition Metal-Free Regioselective Phosphonation of Pyridines: Scope and Mechanism","authors":"Valentin Quint, Thi Hong Van Nguyen, Gary Mathieu, Saloua Chelli, Martin Breugst*, Jean-François Lohier, Annie-Claude Gaumont and Sami Lakhdar*, ","doi":"10.1021/acsorginorgau.2c00055","DOIUrl":"10.1021/acsorginorgau.2c00055","url":null,"abstract":"<p >Regioselective phosphonation of pyridines is an interesting transformation in synthesis and medicinal chemistry. We report herein a metal-free approach enabling access to various 4-phosphonated pyridines. The method consists of simply activating the pyridine ring with a Lewis acid (BF<sub>3</sub>·OEt<sub>2</sub>) to facilitate the nucleophilic addition of a phosphine oxide anion. The formed sigma complex is subsequently oxidized with an organic oxidant (chloranil) to yield the desired adducts in good to excellent yields. We furthermore showed that access to C2-phosphoinated pyridines can be achieved in certain cases with strong Lewis basic phosphorus nucleophiles or with strong Lewis acidic pyridines. Both experimental and computational mechanistic investigations were undertaken and allowed us to understand the factors controlling the reactivity and selectivity of this reaction.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.2c00055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9622734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-02DOI: 10.1021/acsorginorgau.2c00048
Kristian Witthaut, Yurii Prots, Nazar Zaremba, Mitja Krnel, Andreas Leithe-Jasper, Yuri Grin and Eteri Svanidze*,
Amalgams have played an important role in fundamental and applied solid-state chemistry and physics because of the diversity of crystallographic features and properties that they have to offer. Moreover, their peculiar chemical properties can sometimes give rise to unconventional superconducting or magnetic ground states. In the current work, we present an in-depth analysis of single crystals of YHg3 and LuHg3 (Mg3Cd structure type, space group P63/mmc). Both compounds show superconductivity below Tc = 1 ± 0.1 K (YHg3) and Tc = 1.2 ± 0.1 K (LuHg3). Given the high air-sensitivity and toxicity of these compounds, this study was only possible using a number of dedicated experimental techniques.
{"title":"Chemical and Physical Properties of YHg3 and LuHg3","authors":"Kristian Witthaut, Yurii Prots, Nazar Zaremba, Mitja Krnel, Andreas Leithe-Jasper, Yuri Grin and Eteri Svanidze*, ","doi":"10.1021/acsorginorgau.2c00048","DOIUrl":"https://doi.org/10.1021/acsorginorgau.2c00048","url":null,"abstract":"<p >Amalgams have played an important role in fundamental and applied solid-state chemistry and physics because of the diversity of crystallographic features and properties that they have to offer. Moreover, their peculiar chemical properties can sometimes give rise to unconventional superconducting or magnetic ground states. In the current work, we present an in-depth analysis of single crystals of YHg<sub>3</sub> and LuHg<sub>3</sub> (Mg<sub>3</sub>Cd structure type, space group <i>P</i>6<sub>3</sub>/<i>mmc</i>). Both compounds show superconductivity below <i>T</i><sub>c</sub> = 1 ± 0.1 K (YHg<sub>3</sub>) and <i>T</i><sub>c</sub> = 1.2 ± 0.1 K (LuHg<sub>3</sub>). Given the high air-sensitivity and toxicity of these compounds, this study was only possible using a number of dedicated experimental techniques.</p>","PeriodicalId":29797,"journal":{"name":"ACS Organic & Inorganic Au","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsorginorgau.2c00048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49767835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}