[PdCl2(PPh3)2] suspended in MeOH reacts with carbon monoxide (40-80 atm, 50°), in the presence of a base such as NEt3 to give the methoxycarbonyl complex trans-[PdCl(COOMe)(PPh3)2]. When the carbonylation reaction is carried out at 90-100° redn. to Pd0 carbonyl-phosphine complexes occurs, with formation of di-Me carbonate, selectively and in an almost quant. yield. The above complexes are less reactive than the acetato-analogs, which give di-Me oxalate as the main org. carbonylation product even at 50°.
New aspects of the synthesis of dimethyl carbonate via carbonylation of methyl alcohol promoted bymethoxycarbonyl complexes of palladium(II)
TONIOLO, Luigi
1993-01-01
Abstract
[PdCl2(PPh3)2] suspended in MeOH reacts with carbon monoxide (40-80 atm, 50°), in the presence of a base such as NEt3 to give the methoxycarbonyl complex trans-[PdCl(COOMe)(PPh3)2]. When the carbonylation reaction is carried out at 90-100° redn. to Pd0 carbonyl-phosphine complexes occurs, with formation of di-Me carbonate, selectively and in an almost quant. yield. The above complexes are less reactive than the acetato-analogs, which give di-Me oxalate as the main org. carbonylation product even at 50°.File in questo prodotto:
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