S. Gaisford, A. Beezer, J. Mitchell, W. Loh, J. Finnie, Stuart J. Williams
Incubation of dilute polymer solutions with a KI–I2 standard shows the presence of a concentration dependent phase transition for the poly(oxyethylene)+ poly(oxypropylene)+ poly(oxyethylene) block copolymer F87 (P237) using diode-array UV spectrometry; the transition is shown to be reversible and reproducible and is in agreement with previous data obtained via high-sensitivity differential scanning microcalorimetry (HSDSC).
{"title":"Diode-array UV spectrometric evidence for a concentration dependent phase transition in dilute aqueous solutions of pluronic F87 (poloxamer 237)","authors":"S. Gaisford, A. Beezer, J. Mitchell, W. Loh, J. Finnie, Stuart J. Williams","doi":"10.1039/C39950001843","DOIUrl":"https://doi.org/10.1039/C39950001843","url":null,"abstract":"Incubation of dilute polymer solutions with a KI–I2 standard shows the presence of a concentration dependent phase transition for the poly(oxyethylene)+ poly(oxypropylene)+ poly(oxyethylene) block copolymer F87 (P237) using diode-array UV spectrometry; the transition is shown to be reversible and reproducible and is in agreement with previous data obtained via high-sensitivity differential scanning microcalorimetry (HSDSC).","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"63 1","pages":"1843-1844"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80310808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The reaction of lithium 2,6-di-tert-butylphenoxylate and trifluoro(pentamethylcyclopentadienyl)zirconium in a molar ratio of 2:3 leads to [Li4Zr6F18O2(C5Me5)6] which can be viewed as an interstitial oxide compound of [Zr(C5Me5)F3].
{"title":"Intercalation of oxide into [Zr(C5Me5)F3]","authors":"A. Künzel, H. Roesky, M. Noltemeyer, H. Schmidt","doi":"10.1039/C39950002145","DOIUrl":"https://doi.org/10.1039/C39950002145","url":null,"abstract":"The reaction of lithium 2,6-di-tert-butylphenoxylate and trifluoro(pentamethylcyclopentadienyl)zirconium in a molar ratio of 2:3 leads to [Li4Zr6F18O2(C5Me5)6] which can be viewed as an interstitial oxide compound of [Zr(C5Me5)F3].","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"311 1","pages":"2145-2146"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77190877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Burdinski, F. Birkelbach, M. Gerdan, A. Trautwein, K. Wieghardt, P. Chaudhuri
A metallamacrocycle, [LCrIIIµ-{(Hdmg)2(dmg)}CrIIIL](ClO4)2·MeOH (L = 1,4,7-trimethyl-1,4,7-triazacyclononane; dmg = dianion of dimethylglyoxime), is synthesized by a one-step high yield template reaction and characterized by X-ray crystallography and magnetic susceptibility measurements.
金属大环[LCrIIIµ-{(Hdmg)2(dmg)} criil](ClO4)2·MeOH (L = 1,4,7-三甲基-1,4,7-三氮杂环壬烷;dmg = dinaion of dimethylglyxime)，通过一步高产率模板反应合成，并通过x射线晶体学和磁化率测量对其进行了表征。
{"title":"Self-assembly of a novel 14-membered metallamacrobicycle containing two chromium(III) ions as part of the ring skeleton","authors":"D. Burdinski, F. Birkelbach, M. Gerdan, A. Trautwein, K. Wieghardt, P. Chaudhuri","doi":"10.1039/C39950000963","DOIUrl":"https://doi.org/10.1039/C39950000963","url":null,"abstract":"A metallamacrocycle, [LCrIIIµ-{(Hdmg)2(dmg)}CrIIIL](ClO4)2·MeOH (L = 1,4,7-trimethyl-1,4,7-triazacyclononane; dmg = dianion of dimethylglyoxime), is synthesized by a one-step high yield template reaction and characterized by X-ray crystallography and magnetic susceptibility measurements.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"30 1","pages":"963-964"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81490134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A novel compound, 1,6,17,21-octahydrobotryococcene, apparently derived from the green alga Botryococcus braunii, is identified in a sediment from Sacred Lake, Mount Kenya.
{"title":"Identification of 1,6,17,21-octahydrobotryococcene in a sediment","authors":"Y. Huang, M. Murray","doi":"10.1039/C39950000335","DOIUrl":"https://doi.org/10.1039/C39950000335","url":null,"abstract":"A novel compound, 1,6,17,21-octahydrobotryococcene, apparently derived from the green alga Botryococcus braunii, is identified in a sediment from Sacred Lake, Mount Kenya.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"10 1","pages":"335-336"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82069704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Akai, Kiyosei Iio, Y. Takeda, H. Ueno, Kayoko Yokogawa, Y. Kita
The treatment of p-(phenylsulfinyl)phenyl ethers 1 with trifluoroacetic anhydride in the presence of styrene selectively caused the direct ipso-substitution of the sulfinyl groups by trifluoroacetoxy groups, giving the protected dihydroquinone derivatives 3 in high to quantitative yields.
{"title":"Pummerer-type rearrangement on aromatic rings: an unprecedented ipso-substitution of the sulfinyl group of p-sulfinylphenyl ethers into oxygen functional groups leading to protected dihydroquinone derivatives","authors":"S. Akai, Kiyosei Iio, Y. Takeda, H. Ueno, Kayoko Yokogawa, Y. Kita","doi":"10.1039/C39950002319","DOIUrl":"https://doi.org/10.1039/C39950002319","url":null,"abstract":"The treatment of p-(phenylsulfinyl)phenyl ethers 1 with trifluoroacetic anhydride in the presence of styrene selectively caused the direct ipso-substitution of the sulfinyl groups by trifluoroacetoxy groups, giving the protected dihydroquinone derivatives 3 in high to quantitative yields.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"64 1","pages":"2319-2320"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82095676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A simple protocol for the synthesis of quinolone antibiotics is exemplified for the synthesis of norfloxacin; 3-chloro-4-fluoroaniline with triethyl orthoformate is transformed into its N-ethyl-N-formyl derivative which reacts with methyl malonyl morpholide and phosphoryl chloride at 100 °C to give 6-fluoro-7-chloro-1-ethylquinol-4-one-3-carboxylic acid, which has previously been converted into norfloxacin by the action of piperazine.
举例说明了合成诺氟沙星的喹诺酮类抗生素的简单方案;3-氯-4-氟苯胺与原甲酸三乙酯转化为其n -乙基- n -甲酰基衍生物，该衍生物与丙二酰甲酯和氯磷酰在100℃下反应得到6-氟-7-氯-1-乙基喹啉-4- 1- 3-羧酸，该羧酸先前通过哌嗪的作用转化为诺氟沙星。
{"title":"A new short and efficient strategy for the synthesis of quinolone antibiotics","authors":"A. Jackson, O. Meth–Cohn","doi":"10.1039/C39950001319","DOIUrl":"https://doi.org/10.1039/C39950001319","url":null,"abstract":"A simple protocol for the synthesis of quinolone antibiotics is exemplified for the synthesis of norfloxacin; 3-chloro-4-fluoroaniline with triethyl orthoformate is transformed into its N-ethyl-N-formyl derivative which reacts with methyl malonyl morpholide and phosphoryl chloride at 100 °C to give 6-fluoro-7-chloro-1-ethylquinol-4-one-3-carboxylic acid, which has previously been converted into norfloxacin by the action of piperazine.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"23 1","pages":"1319-1319"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78861905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Needham, T. Hu, J. Mclachlan, J. Walter, Jeffrey L. C. Wright
Stable isotope incorporation experiments with 13C- and 18O-labelled precursors show that all the carbon atoms in DTX-4 2 and an okadaic acid diol ester 3 are derived from acetate and glycolate, and also identify the acetate and glycolate derived oxygen atoms.
{"title":"Biosynthetic studies of the DSP toxin DTX-4 and an okadaic acid diol ester","authors":"J. Needham, T. Hu, J. Mclachlan, J. Walter, Jeffrey L. C. Wright","doi":"10.1039/C39950001623","DOIUrl":"https://doi.org/10.1039/C39950001623","url":null,"abstract":"Stable isotope incorporation experiments with 13C- and 18O-labelled precursors show that all the carbon atoms in DTX-4 2 and an okadaic acid diol ester 3 are derived from acetate and glycolate, and also identify the acetate and glycolate derived oxygen atoms.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"35 1","pages":"1623-1624"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76442502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Janssen, L. Lindoy, Owen A. Matthews, G. Meehan, A. Sobolev, Allan H. White
The synthesis of two new large cryptands 7a and 7b has been carried out and the X-ray structure of 7b confirms that a benzene guest molecule is encapsulated centrally in its cavity.
合成了两个新的大密码子7a和7b, 7b的x射线结构证实了苯客体分子被包裹在其腔内。
{"title":"Synthesis and crystal structure of a new large cryptand encapsulating a benzene molecule","authors":"R. Janssen, L. Lindoy, Owen A. Matthews, G. Meehan, A. Sobolev, Allan H. White","doi":"10.1039/C39950000735","DOIUrl":"https://doi.org/10.1039/C39950000735","url":null,"abstract":"The synthesis of two new large cryptands 7a and 7b has been carried out and the X-ray structure of 7b confirms that a benzene guest molecule is encapsulated centrally in its cavity.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"130 1","pages":"735-736"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76523294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Benincori, E. Brenna, F. Sannicolo, Licia Trimarco, G. Moro, D. Pitea, T. Pilati, G. Zerbi, G. Zotti
Using conformatcnally constrained bi- and ter-thiophenes, the effects of inter-ring torsional angles on spectroscopic properties of the corresponding polymers are demonstrated; effects on conductivity are complicated by inter-chain contributions.
{"title":"Conformational effects on electrical and spectroscopic properties of bi-, ter-, and poly-thiophenes","authors":"T. Benincori, E. Brenna, F. Sannicolo, Licia Trimarco, G. Moro, D. Pitea, T. Pilati, G. Zerbi, G. Zotti","doi":"10.1039/C39950000881","DOIUrl":"https://doi.org/10.1039/C39950000881","url":null,"abstract":"Using conformatcnally constrained bi- and ter-thiophenes, the effects of inter-ring torsional angles on spectroscopic properties of the corresponding polymers are demonstrated; effects on conductivity are complicated by inter-chain contributions.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"49 1","pages":"881-882"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75987641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Degradation studies and partial synthesis are used to establish the full structure and absolute stereochemistry of the nucleoside antifungal agent FR-900848.
通过降解研究和部分合成，建立了核苷类抗真菌剂FR-900848的完整结构和绝对立体化学结构。
{"title":"Determination of the full structure and absolute stereochemistry of the antifungal agent FR-900848: an X-ray crystallographic study of (1R,3S,4R,6S,7S,9R,10S,12R)-quatercyclopropyl-1,12-dimethanediyl di-4-bromobenzoate","authors":"A. Barrett, K. Kasdorf, G. Tustin, D. Williams","doi":"10.1039/C39950001143","DOIUrl":"https://doi.org/10.1039/C39950001143","url":null,"abstract":"Degradation studies and partial synthesis are used to establish the full structure and absolute stereochemistry of the nucleoside antifungal agent FR-900848.","PeriodicalId":17282,"journal":{"name":"Journal of The Chemical Society, Chemical Communications","volume":"1 1","pages":"1143-1144"},"PeriodicalIF":0.0,"publicationDate":"1995-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75991091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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