Preliminary study on the 1-hexene hydromethoxycarbonylation with nickel catalytic systems containing mono- and diphosphines
Abstract
In this work, it was evaluated the catalytic activity of nickel systems formed in situ by addition of mono- (PPh3) and diphosphines (dppe, dppp and dppb) to NiCl2.6H2O for the homogeneous ydrometoxycarbonylation of 1-hexene in the presence of carbon monoxide and of an acid. The system Ni/4PPh3 in the presence of ten equivalents of p-toluensulphonic acid showed the highest activity, under mild reaction conditions (140 ºC, 50 atm de CO), obtaining the esters methyl heptanoate and methyl 2-methylhexanoate (n/i < 1). The systems Ni/diphosphine showed activities lower than Ni/4PPh3, where the tendency was dppe > dppp ~ dppb. The experimental results showed that the hydrometoxycarbonylation reaction proceeds through an intermediate containing one triphenylphosphine ligand, possibly [NiH(CO)2(PPh3)]+.
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