Recently, our laboratory described a novel microwave-mediated coupling reaction between carboxylic acids and isonitriles leading to the formation of N-formyl amides. 1 These N-formyl amides are readily converted to biologically important linkages such as amides, N-hydroxymethyl amides and N-methyl amides. 2 Further experimental 3 and computational 4 investigations showed that E and/or Z formimidate carboxylate mixed anhydrides (FCMAs), formed from the merger ...