The stereoselective synthesis of oxazolidine derivatives was accomplished,starting from ephedrine,pseudo-ephedrine and substituted benzaldehyde.Seven kinds of new substituted phenyl-3,4-dimethyl-5 phenyloxazolidine we...The stereoselective synthesis of oxazolidine derivatives was accomplished,starting from ephedrine,pseudo-ephedrine and substituted benzaldehyde.Seven kinds of new substituted phenyl-3,4-dimethyl-5 phenyloxazolidine were first reported.At the same time,the stereochemical structures and the spectral characteristics were studied for these oxazolidines.展开更多
The essential oil of Rhodiola from Qinghai was extracted by steam distillation.The chemical constituents of the essential oil were analyzed by gas chromatography-mass spectrometry(GC/MS). More than 100 peaks were sepa...The essential oil of Rhodiola from Qinghai was extracted by steam distillation.The chemical constituents of the essential oil were analyzed by gas chromatography-mass spectrometry(GC/MS). More than 100 peaks were separated.展开更多
文摘The stereoselective synthesis of oxazolidine derivatives was accomplished,starting from ephedrine,pseudo-ephedrine and substituted benzaldehyde.Seven kinds of new substituted phenyl-3,4-dimethyl-5 phenyloxazolidine were first reported.At the same time,the stereochemical structures and the spectral characteristics were studied for these oxazolidines.
文摘The essential oil of Rhodiola from Qinghai was extracted by steam distillation.The chemical constituents of the essential oil were analyzed by gas chromatography-mass spectrometry(GC/MS). More than 100 peaks were separated.
