Structural Studies by NMR (). Conformations and Configurations of ,-Unsaturated Phenylhydrazones

[摘要] Conformations and cofigurations were studied for some ¥á,¥â-unsaturated phenylhydrazones which have similar structures to the stucture of butenedial bistosylhydrazone, a precursor of tetrahedrane, by the analysis of their nmr spectra. The chemical shift difference between two solvents, benzene and aliphatic solvents, was applied for the assigning syn and anti structures of phenylhydrazone isomers as a convenient method. In this work, it was found that the phenylhydrazones have syn configurations and also found that the dihedral angles of CHa-CHb are around 150¢ª at room temperature from the the interpretation of the vicinal spin-spin coupling constants. These results were discussed in concerning with their conformations.

[学科分类] 化学（综合）