Showing papers by "Kunisuke Izawa published in 1974"

Substituent Effects on the 13C and 1H Chemical Shifts of 1-Phenyl-1,3-butadiene and Phenylallene

Abstract: CMR and PMR spectra of trans-1-phenyl-1,3-butadiene (PBD) and phenylallene (PA) and their ring-substituted derivatives (p-CH3, m-CH3, p-Cl, and m-Cl) have been measured. The chemical shifts of side-chain carbons and protons were treated with a Hammett-type relationship. The carbon chemical shifts of the side chain gave alternately opposite sign of ρ values while those of PA showed little dependence on the ring substitution. The 1H chemical shifts showed behavior different from that of the 13C shifts. The mode of electron polarization along the side-chain of PBD and PA was discussed to interpret the observations.