I.INTRODUCTION The research on intramolecular rearrangement processes of diamagnetic complexes formed by polyaminepolycarboxylic ligands has been continuing, since the relationship between H-NMR spectra of the complex...I.INTRODUCTION The research on intramolecular rearrangement processes of diamagnetic complexes formed by polyaminepolycarboxylic ligands has been continuing, since the relationship between H-NMR spectra of the complexes formed by EDTA and pH value was stud- ied by Kula and others in 1963. It is known that DNMR can be used to展开更多
Ring inversion of eight substituted 2-phenyl-4,4-dimethyloxazolidines in o-dichloro- benzene-d_4 was studied by ~H DNMR.Very high inversion barriers((?)G_c(?)=86.7—93.4 kJ·mol^(-1)) were found for these oxazolid...Ring inversion of eight substituted 2-phenyl-4,4-dimethyloxazolidines in o-dichloro- benzene-d_4 was studied by ~H DNMR.Very high inversion barriers((?)G_c(?)=86.7—93.4 kJ·mol^(-1)) were found for these oxazolidine rings.The magnitude of the inversion barrier is dependent on the polarity of the substituent on the phenyl group.A linear correlation is present between the (?)G_c(?) of the inversion and the substituent constant,σ^+,of the substituent.展开更多
利用NMR、2DNMR及IR、UV、MS等实验技术详细研究了胰岛素增敏剂马来酸罗格列酮的波谱学特征。借助马来酸罗格列酮及罗格列酮的DEPT谱和罗格列酮的二维1 H 1 HCOSY、1 3 C 1 HCOSY对马来酸罗格列酮氢谱和碳谱进行了完全的归属 ,为该类化...利用NMR、2DNMR及IR、UV、MS等实验技术详细研究了胰岛素增敏剂马来酸罗格列酮的波谱学特征。借助马来酸罗格列酮及罗格列酮的DEPT谱和罗格列酮的二维1 H 1 HCOSY、1 3 C 1 HCOSY对马来酸罗格列酮氢谱和碳谱进行了完全的归属 ,为该类化合物的结构解析提供了有益的分析依据。展开更多
基金Project supported by the National Natural Science Foundation of China
文摘I.INTRODUCTION The research on intramolecular rearrangement processes of diamagnetic complexes formed by polyaminepolycarboxylic ligands has been continuing, since the relationship between H-NMR spectra of the complexes formed by EDTA and pH value was stud- ied by Kula and others in 1963. It is known that DNMR can be used to
文摘Ring inversion of eight substituted 2-phenyl-4,4-dimethyloxazolidines in o-dichloro- benzene-d_4 was studied by ~H DNMR.Very high inversion barriers((?)G_c(?)=86.7—93.4 kJ·mol^(-1)) were found for these oxazolidine rings.The magnitude of the inversion barrier is dependent on the polarity of the substituent on the phenyl group.A linear correlation is present between the (?)G_c(?) of the inversion and the substituent constant,σ^+,of the substituent.
