... Printed in Great Eritain Pergamon Press plc GAS-PHASE REPLACEMENT u" SUBSTITUENT CONSTANTS OF HETEROARYL GROUPS' Nouria A. Al-Awadi*, Rasha F. Al-Bashir, Osman ME ElDusouqui* Department of Chemistry, University of Kuwait PO Box 5969 Safat, 13060 Safat, Kuwait ABSTRACT: Hammett replacement a* substituent constants of pyridyl, thienyl, and fury1 groups are reported for the first time from gas-phase ...