Journal of Organometallic Chemistry p. 421 - 425 (1989)
Update date:2022-08-03
Topics:
Chinakov, V. D.
Il'inich, G. N.
Zudin, V. N.
Likholobov, V. A.
Nekipelov, V. M.
The most probable intermediate formed by interaction of CO and C2H4 with <(PPh3)3PtH>+ (I), in the synthesis of diethylketone from C2H4, CO and H2 under action of the catalytic system (PPh3)2Pt(OAc)2/PPh3/CF3COOH has been studied by 1H, 13C, 31P NMR spectroscopy.Complex I readily reacts with CO in CF3COOH solutions to form a carbonyl hydride complex trans-<(PPh3)2Pt(CO)H>+ (II).In contrast to I, II undergoes ethylene insertion at the Pt-H bond in the presence of a catalytic additive Sn(OAc)2.The carbonyl ethyl complex trans<(PPh3)2Pt(CO)(C2H5)>+ (III) formed quantitatively from this insertion is stable to isomerization to the corresponding complex indicating that the carbonylation of the Pt-ethyl bond is the rate-determining step of the diethyl ketone synthesis.
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