Correlation of IR parameters with reactivity characteristics for the hydrazides of carboxylic acids期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Correlation of IR parameters with reactivity characteristics for the hydrazides of carboxylic acids

Authors:	E V Titov A P Grekov V I Rybachenko V V Shevchenko

Institution:	(1) Donetsk Division of Physical Organic Chemistry, Pisarzhevskii Institute of Physical Chemistry, AS UkrSSR, USSR;(2) Institute of the Chemistry of High-Molecular Compounds, AS UkrSSR, USSR;(3) Donetsk State University, USSR

Abstract:	Measurements have been made of the frequencies of the N-H and C=O stretching modes in dilute solution in CCl₄ for 23 aliphatic and aromatic substituted hydrazides of carboxylic acids. These are compared with the (⁰) Taft constants. Measurements have also been made of the basicity constants at 25 in water and the rate constants for reaction with phenyl isocyanate at 25. Correlation equations are derived for the transfer of electronic effects across the -CONH-bridge. It is found that the sign of the reaction constant in the correlation of $\upsilon _{{\text{NH}}_{\text{2}} }$ with ⁰ reverses on passing from aromatic amines to amides via the hydrazides of carboxylic acids.We are indebted to L. M. Litvinenko and A. F. Popov for a discussion of the results.

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