Reactivity of Pent-1-EN-4-Ynes and Synthesis of 2-Substituted Derivatives

Abstract
The synthesis of some 2-substituted pent-1-en-4-ynes via an SN 1 reaction is described. Using dicobalt octacarbonyl as protecting group, selective bromination of 1,5-diphenylpent-1-en-4-yne is achieved.