Nuclear magnetic resonance and infrared spectra of some aldimines (azomethines)

Abstract

N.m.r. and i.r. spectra are reported for 19 imines of the type PC[graphic omitted]N–C[graphic omitted]QR (P = alkyl or aryl and Q, R =(H,alk), (alk,alk), or –[CH₂]_n–). The variation in |J_ab| with structure is examined, and evidence is found for conformational effects similar to those for allylic coupling. The CN stretching frequencies fall into characteristic and separate ranges for P = alkyl and P = aryl but finer effects are not generally apparent.