Direct proof for the occurrence of anions in the base‐induced 1,4‐elimination of alcohol from 1,4‐dialkoxy‐2‐butynes

Abstract
1,4‐Elimination of alcohols from ether of the type RO‐CH2 ‐C≡C‐CH2‐OR by treating these compounds with alkali amide, appears to be not a concerted process, but to proceed via short‐lived anions. These anions can be intercepted by ethyl bromide, present during the reaction.