Abstract
The Keggin-type heteropolyanion containing Mo or V as addenda atoms shows an appreciable promoting effect on the catalysis of PdCl 2 in the reductive carbonylation of nitrobenzene to form methyl N-phenylcarbamate in the presence of methanol in a moderately polar solvent such as 1,2-dimethoxyethane at 130–170°C under an initial CO pressure of 11–41 atm. The catalyst was recovered and reused to give a total Pd turnover of 168. Partially reduced heteropolyanion was effective for modifying Pd(II), presumably as a basic macroligand.
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