Double carbonylation of alkynes using NaHFe(CO)4
Abstract
The reagent generated in situ using NaHFe(CO)4 and MeI in THF, on reaction with alkynes followed by CuCl2 oxidation, gives the corresponding cyclobutenediones in moderate yields (27–42%) in addition to the corresponding α,β-unsaturated carboxylic acids (10–22%).