Abstract
Reaction of η 2-enone and enal-platinum(0) complexes Pt(CH 2CHCOR)(PPh 3) 2 (R=H, Me) with Lewis acidic compounds BX 3 (X=F, C 6F 5) afforded adducts formed by coordination of boron to oxygen of the carbonyl group. The X-ray structure determination of the adduct formed from B(C 6F 5) 3 and η 2-methylvinylketone complex showed no strong interaction between Pt and carbonyl carbon. In contrast to the inability of the palladium(0) η 2-enone complexes to form any Me 3Al adduct, η 2-cyclohexenoneplatinum(0) complex formed an isolable adduct with Me 3Al, 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 η 2-enone or enal-platinum(0) complexes as well as the ordinary η 3-allylplatinum cation [Pt(PPh 3) 2(MeCHCHCH 2)] +.
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