Ethynyl‐1,2‐benziodoxol‐3(1H)‐one (EBX): An Exceptional Reagent for the Ethynylation of Keto, Cyano, and Nitro Esters.

In situ desilylation of reagent (II) generates a highly reactive ethynylation species which is successfully applied in the acetylene transfer towards various cyclic and acyclic keto, cyano and nitro esters.