Is the collision induced loss of methanol from deprotonated 4-methoxybut-1-yne in the gas phase a charge remote reaction?

Abstract

The collision induced loss of methanol from deprotonated 4-methoxybut-1 -yne occurs by at least two mechanisms, viz. (a) a stepwise cyclization–deprotonation–ring opening process involving the acetylenic π electrons, and (b) a 1,2-elimination process which may either be (i) a process in which cyclisation involving the π electrons and loss of methanol are synchronous, or (ii) a ‘remote’ concerted process which does not involve the acetylenic centre.