| abstract |
A process for the carbonylation of an allenically unsaturated compound with CO in the presence of water, an alcohol and/or a carboxylic acid, which process is carried out in the presence of a catalyst formed by combining: (a) a compound of divalent palladium, (b) at least 15 mol of an organic phosphine per gram atom of divalent palladium, and (c) a protonic acid having a pKa greater than 1.5 and/or a carboxylic acid having a pKa not greater than 1.5, both measured at 18 DEG C. in aqueous solution. |