Abstract
AbstractCatalytic amounts of calcium and hydrogen triflimides [Ca(NTf2)2, HNTf2] were found to be efficient for the solvent‐free formylation of a variety of weakly basic anilines by using cheap and widely available methyl formate as the formylating agent under microwave irradiation. Initial investigations showed that in the case of calcium triflimide, Brønsted acid catalysis was most likely operating. Remarkably, the corresponding calcium triflate and triflic acid were significantly less active.
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