Proton magnetic resonance spectra of some para-substituted derivatives of 9-phenylazojulolidine (9-phenylazo-2,3,6,7-tetrahydro-1H,5H-benzo[ij]quinolizine)
Abstract
The 1H n.m.r. spectra of a series of para-substituted derivatives of 9-phenylazojulolidine have been examined. A linear relation has been found between the internal chemical shift of the ring protons and the Hammett substituent constant σp.