A comparative study of the chemical shift differences observed in the 1 H NMR spectra of a series of fifteen new polysubstituted 4-aryl- and 2,4-diaryl thiazoles permitted us to establish two groups of rotamers. Some present paramagnetic shifts due to intramolecular weak hydrogen bonding and this was confirmed by experiments "at infinite dilution", single crystal X-Ray studies, NOESY and HMBC experiments.
{"title":"1H NMR evidence of C-O, C--N and C-H--Cl hydrogen bonds in new thiazole derivatives","authors":"F. Viesca, M. R. Gómez, Martha I Berros","doi":"10.3987/COM-02-9478","DOIUrl":"https://doi.org/10.3987/COM-02-9478","url":null,"abstract":"A comparative study of the chemical shift differences observed in the 1 H NMR spectra of a series of fifteen new polysubstituted 4-aryl- and 2,4-diaryl thiazoles permitted us to establish two groups of rotamers. Some present paramagnetic shifts due to intramolecular weak hydrogen bonding and this was confirmed by experiments \"at infinite dilution\", single crystal X-Ray studies, NOESY and HMBC experiments.","PeriodicalId":21276,"journal":{"name":"Revista Latinoamericana de Química","volume":"57 1","pages":"72-78"},"PeriodicalIF":0.0,"publicationDate":"2002-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84547592","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}
Pub Date : 2000-01-01DOI: 10.1021/bk-1997-0658.ch024
I. Kubo
{"title":"Tyrosinase inhibitors from plants","authors":"I. Kubo","doi":"10.1021/bk-1997-0658.ch024","DOIUrl":"https://doi.org/10.1021/bk-1997-0658.ch024","url":null,"abstract":"","PeriodicalId":21276,"journal":{"name":"Revista Latinoamericana de Química","volume":"11 1","pages":"7-20"},"PeriodicalIF":0.0,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85791473","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}
{"title":"Recent advances in the chemistry of proanthocyanidin polymers","authors":"L. Porter","doi":"10.1002/CHIN.198518358","DOIUrl":"https://doi.org/10.1002/CHIN.198518358","url":null,"abstract":"","PeriodicalId":21276,"journal":{"name":"Revista Latinoamericana de Química","volume":"21 1","pages":"43-49"},"PeriodicalIF":0.0,"publicationDate":"1985-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90770593","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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