... FUK-WAH SUM AND LARRY WEILER' Department of Chemistry, Unioersity of British Columbia, Vancouoer, BC, Canada V6T I W5 Received November 2,1978 FUK ... J. CHEM. ... In particular, the chemical shift of P-methyl groups in a,P-unsaturated esters is 6 2.1-2.2 for a P-methyl ...