Abstract
Abstract In the presence of 1 mol% octacarbonyl dicobalt ethyl diazoacetate can be transformed at room temperature and carbon monoxide pressure selectively into diethyl 2-diazo-3-oxo-pentanedicarboxylate or in the presence of an alcohol (methanol, ethanol, tert -butanol), phenol or diethylamine into the corresponding malonic acid derivatives in high yields. Ethoxycarbonylcarbene-bridged dicobalt carbonyl complexes [μ 2 -{ethoxycarbonyl(methylene)}-μ 2 -(carbonyl)-bis(tricarbonyl-cobalt)( Co – Co )] and [di-μ 2 (ethoxycarbonyl(methylene)}-bis(tricarbony-cobalt)( Co–Co )] proved to be intermediates in the catalytic reactions.
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