13C n.m.r. examination of ethyl cyano(arylhydrazono)acetates
Abstract
The products of the condensation of aryldiazonium salts with ethyl cyanoacetate are the (Z)- and (E)-isomers of the hydrazono forms. These have been examined separately by 13C n.m.r. spectroscopy which allows their specific identification. The effects of the geometric configurations and of substituents within the aromatic rings on the cyanoacetic acid carbon resonances have been examined.