Synthesis and isomerism of azines based on 3-methyl-2-benzothiazolinone hydrazone

Abstract

R was found by ESR spectroscopy that asymmetric azines obtained from 3-methyl-2-benzothiazolinone hydrazone can exist in solutions in the form of a mixture of syn and anti isomers, depending on the structure of the carbonyl compound introduced into the condensation reaction.E,Z-Geometric syn and anti isomerism of azines of aliphataic and aromatic carbonyl compounds has been treated in several papers [1][2][3][4]. Asymmetric azines based on 3-methyl-2-benzothiazolinone hydrazone were prepared for the purpose of further synthesis of cyanine dyes [5], but the literature lacks any data on their structure. In order to fill the existing gap in this area, we expanded the number of asymmetric azines based on 3-methyl-3-benzothiazolinone hydrazone and studied the structure of the azines obtained.Azines I-XIII were isolated in the reaction of condensation of 3-methyl-2-benzothiazolinone hydrazone with aldehydes and ketones containing different functional groups.