[1 + 4]-Cycloadditions of silylenes to 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene
Clendenning, Scott B.; Gehrhus, Barbara; Hitchcock, Peter B.; Moser, Daniel F.; Nixon, John F.; West, Robert; Clendenning Scott B.; The School of Chemistry, Physics and Environmental Science, University of Sussex; Gehrhus Barbara; The School of Chemistry, Physics and Environmental Science, University of Sussex; Hitchcock Peter B.; The School of Chemistry, Physics and Environmental Science, University of Sussex; Moser Daniel F.; Department of Chemistry, Organosilicon Research Center, University of Wisconsin-Madison; Nixon John F.; The School of Chemistry, Physics and Environmental Science, University of Sussex; West Robert; Department of Chemistry, Organosilicon Research Center, University of Wisconsin-Madison
Журнал:
Journal of the Chemical Society, Dalton Transactions
Дата:
2002
Аннотация:
2,4,6-Tri-tert-butyl-1,3,5-triphosphabenzene 1 undergoes [1 + 4]-cycloaddition with the stable bis(amino)silylenes Si[(NCH2Bu<sup>t</sup>)2C6H4-1,2] 3, Si[(NBu<sup>t</sup>)2C2H2] 4 and Si[(NBu<sup>t</sup>)2C2H4] 7 to afford the structurally characterised 5, 6 and 11. The intermediate aminosilylsilylene resulting from the dissociation of the disilene [Si{(NBu<sup>t</sup>)2C2H4}]4 9 was trapped as its [1 + 4]-cycloadduct with 1, which was also structurally characterised. The reversibility of the cycloaddition was demonstrated for 5 through reaction with [Mo(CO)4(nbd)] to afford [Mo(CO)3(η<sup>6</sup>-P3C3Bu<sup>t</sup>3)] (13) and a mixture of cis- (14a) and trans-[Mo(CO)4(3)2] (14b) of which 14b has been structurally characterised by a single crystal X-ray diffraction study.
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