Reaction of η2-enone and enal-platinum(0) complexes with Lewis acidic compounds
摘要:
Reaction of eta(2)-enone and enal-platinum(0) complexes Pt(CH2=CHCOR)(PPh3)(2) (R=H, Me) with Lewis acidic compounds BX3 (X = F, C6F5) afforded adducts formed by coordination of boron to oxygen of the carbonyl group. The X-ray structure determination of the adduct formed from B(C6F5)(3) and eta(2)-methylvinylketone complex showed no strong interaction between Pt and carbonyl carbon. In contrast to the inability of the palladium(0) eta(2)-enone complexes to form any Me3Al adduct, eta(2)-cyclohexe-noneplatinum(0) complex formed an isolable adduct with Me3Al, the structure of which was also confirmed by X-ray analysis. The NMR spectral parameters (Pt-C, Pt-P and P-P coupling constants) of these adducts were compared with those of the original eta(2)-enone or enal-platinum(0) complexes as well as the ordinary eta(3)-allylplatinum cation [Pt(PPh3)(2)(MeCHCHCH2)](+). (C) 2004 Elsevier B.V. All rights reserved.