Frustrated Lewis Pair Route to Hydrodesilylation of Silylphosphines
2013-08-26T00:00:00Z (GMT) by
A 1:1 mixture of P(SiMe3)3 and B(p-C6F4H)3 reacts with 3 equiv of 4-heptanone to afford a 1:2 mixture of [(Me3SiO)(n-Pr)2C]H2P–B(p-C6F4H)3 and the silyl enol ether, 4-trimethylsiloxy-3-heptene. Subsequent thermolysis of the adduct produces H3P–B(p-C6F4H)3 and an additional equiv of silyl enol ether. In the presence of a catalytic quantity of B(p-C6F4H)3, however, P(SiMe3)3 reacts with 4-heptanone to produce a 1:1 mixture of [(Me3SiO)(n-Pr)2C]2PH and silyl enol ether. Heating this mixture further produces [(Me3SiO)(n-Pr)2C]PH2, which is eventually converted to elemental phosphorus.