Copper-catalyzed syn -hydroformylation of alkynes with silanes and N , N -dimethylformamide dimethylacetal.

A copper-catalyzed syn -hydrocarbonization of internal alkynes with N , N -dimethylformamide dimethylacetal and silanes has been disclosed that offers an efficient and expedient access to ( E )-α,β-unsaturated aldehydes. This highly selective process, which can be performed at gram-scale, enjoys operational simplicity, as well as syngas-free conditions.