Structural Studies on Conjugated Oximes (II). Nuclear Magnetic Resonance spectral Analysis on the Configuration and Hydrogen Bond of cis-2-Butenedialdioxime in Solutions

Conjugated Oxime의 立體構造에 關한 硏究 (第2報). NMR에 依한 cis-2-Butenedialdioxime의 Configuration 및 水素結合에 對한 考察

  • Published : 1975.08.30

Abstract

The configuration of two oxime groups in cis-2-butenedialdioxime, unsymmetrical compound conjugated by three double bonds, is determined by a NMR study on the effects of the solvent, temperature and concentration; it is certain that, in solutions of usual conditions, the configuration exists as only "syn-syn". And the relative strengths of the hydrogen bond between these oxime groups and several solvents are compared and somc effects of the temperature and concentration are also considered. The several models of hydrogen bond between oxime and solvents are proposed; especially it is to be noted here that the hydrogen bond in pyridine solvent is not resulted from the interaction between a lone electron pair on nitrogen atom of pyridine and the hydroxyl proton of oxime, but the result of $\pi$-complex formed between the $\pi$-orbital of pyridine and the hydroxyl proton of the solute.

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