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1.
Ivan R. Pitta Claude Bosso Alexandre J. S. Góes Maria C. A. Lima Suely L. Galdino Cuong Luu-Duc 《光谱学快报》2013,46(3):419-431
In the present investigation, a study of the electron-impact mass spectrometry in positive- and negative-ion modes is reported for a series of 3-chlorobenzyl-5-benzylidene-imidazolidine-2,4-dione and -thiazolidine-2,4-dione derivatives previously synthetized. 相似文献
2.
In this study the structural and stereo chemical analysis of some 9-Phenyl-8-N-Substituted thiocarbamoyl-7,8-diazabicyclo[4.-3.0] and the new synthesized 5-Methyl–9-phenyl-8-N-Substituted-thiocarbamoyl-7, 8-diazabicyclo[4.-3.0]non-6-enes derivatives were studied by 2D NMR, 1D NOE experiments and electron impact mass spectrometry were reported. The N-substituted thiocarbamoyl compounds were mixtures of diastereomers as evidenced by differing Rf values on TLC plates. They were separated by successive applications of preparative TLC and structures were elucidated by IR, 1R-NMR, 13C-NMR, DEPT, 2D-NMR and EI-MASS techniques. The is-trans isomerism of the compounds were determined by means of 1H-NMR, 13C-NMR and 1D NOE difference experiments. The conformation analysis of the bicyclic ring system was based on NOE difference experiments and NOESY spectra of compound-11. For the application of 1D NOE experiments, compound 11 was selected. 相似文献