Catalytic Hydromethoxylation of Acetylene over Pre-Activated K2PdCl4

The catalytic addition of methanol to the triple bond of acetylene occurred on the surface of mechanically pre-activated K 2 PdCl 4 and formed dimethylacetal and the vinyl chloride by-product. The addition of alcohol occurs regioselectively in accordance with the Markovnikov rule. The stereoselectivity of acetylene hydrochlorination corresponds to the trans -addition of H and Cl to the C≡C triple bond of acetylene. The effective activation energies of reaction routes were determined. A possible mechanism of formation of H 3 C–CH(OCH 3 ) 2 and H 2 C=CHCl was proposed.