The complex [W(CO)(5){PClPh2}] reacts with AlCl3 to form a mixture of the phosphenium complex [W(CO)(5){PPh2}][AlCl4] and an isocarbonyl, with GaCl3 to form [W(CO)(5){PPh2}][GaCl4], and with silver trifluoromethanesulfonate to form [W(CO)(5){P(OSO2CF3)Ph-2}]. All three complexes react as strong P electrophiles, undergoing electrophilic substitution reactions with aromatic and heteroaromatic compounds, alkenes, and alkynes, to form aromatic and heteroaromatic phosphines, allyl phosphines, and alkynyl phosphines, respectively. Alkenes lacking cleavable gamma-H atoms and internal alkynes undergo tandem electrophilic addition/substitution reactions, adding between the P and one of the phenyl rings to form fused P heterocycles. The newly formed phosphines can be removed from the tungsten complex by photolysis in the presence of bis(diphenylphosphino)ethane.
Alkinylphosphinhaltige substitutionsprodukte von chrom- und wolfram-hexacarbonyl
作者:A Hengefeld、R Nast
DOI:10.1016/0022-328x(84)80170-9
日期:1984.5
The photochemical preparation of [M(CO)5(P(CCC6H5)n(C6H5)3-n], cis-[M(CO)4(PCCC6H5)n(C6H5)3-n] (M = Cr, W; n = 1,2,3) and fac-[Cr(CO)3(P(CCC6H5)(C6H5)3] by the corresponding substitution reactions of the hexacarbonyls is described. The IR and Raman spectra of the complexes in the region of the ν(CO) and ν(CC) vibrations and the 31P NMRspectra are discussed.