Methanol → Diethyl (2,6-dimethoxybenzyl)malonate

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A mixture of 2.8 g of diethyl (2,6-dimethoxybenzylidene)malonate, 0.6 g of palladium-carbon, 50 ml of methanol and 50 ml of glacial acetic acid was stirred at 25° C. overnight. The solution was filtered and concentrated, and the residue was taken up in ethyl acetate and extracted with 20% NaHCO3 and some ice. Thereafter, the mixture was extracted with 1N, HCl, back-washed with saturated NaCl solution, the organic phase was dried and evaporated under reduced pressure. The crude product was distilled in a high vacuum at 170° C./0.6 mbar. 2.1 g of diethyl (2,6-dimethoxybenzyl)malonate were obtained.

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