483328-98-9Relevant academic research and scientific papers
Synthesis and reactions of cis-sily(boryl)platinum(II) complexes
Sagawa, Takashi,Asano, Yasuaki,Ozawa, Fumiyuki
, p. 5879 - 5886 (2002)
Four kinds of sily(boryl)platinum(II) complexes, 2a-2d, have been prepared by oxidative addition of silylboranes to platinum(0) complexes, in situ generated from Pt(cod)2 and 2 molar quantity of tertiary phosphine ligands (L) in Et2O: cis-Pt(SiMe2Ph)(BX2)L2 (X2 = -OCMe2CMe2O- (pin), L = PMe3 (2a), PMe2Ph (2b), PEt3 (2c); X2 = -NMeCH2CH2NMe- (dmeda), L = PMe3 (2d)). Complexes 2a-2c undergo selective insertion of phenylacetylene into the Pt-B bond at room temperature in CD2Cl2, giving cis-Pt{C(Ph)=CH(Bpin)}(SiMe2Ph)L2 (L = PMe3 (3a), PMe2Ph (3c), PEt3 (3c)), respectively, while 2d is inactive toward insertion. The X-ray structure of 3b has been determined. Kinetic study using 2a indicates the mechanism involving prior dissociation of L, followed by insertion of phenylacetylene into the Pt-B bond. The insertion complexes 3a-3c undergo C-Si reductive elimination to give (Z)-α-silyl-β-borylstyrene. The reactivity decreases in the order 3c ? 3b > 3a.
