Formation of platinum allyl and propargyl complexes from protonation of platinum enyne and diyne complexes
摘要:
Protonation of (Ph3P)(2)Pt[eta(2)-HC drop CC(CH3)=CH2] (2a) with excess HBF4 . Et2O produced the pi-allyl complex (Ph3P)(2)Pt[eta(3)- H2C=CC(CH3)=CH2]+BF4-(3a-BF4) instead of a pi-propargyl complex. Reaction of excess CF3CO2H with 2a initially produced the analogous pi-allyl complex 3a-CF3CO2 which then added CF3CO2H across the vinylidene unit of 3a-CF3CO2 to give the pi-allyl complex (Ph3P)(2)Pt[eta(3)-CH3C(CF3CO2) C(CH3)CH2]+CF3CO2-(5a). Protonation of the platinum diyne complex [(p-CH3-C6H4)(3)P](2)Pt(eta(2)- CH3C drop CC drop CCH3) (7b) with HBF4Et2O at -73 degrees C initially produced the platinum hydride complex trans-[(p-CH3-C6H4)(3)P](2)- PtH(eta(2)-CH3C drop CC drop CCH3)+BF4-(9), which rearranged to the platinum pi-propargyl complex [(p-CH3-C6H4)(3)P](2)Pt[eta(3)-(CH3CH=)-CC drop CCH3]+BF4-(11) at -28 degrees C. (C) 1997 Elsevier Science S.A.
Formation of platinum allyl and propargyl complexes from protonation of platinum enyne and diyne complexes
摘要:
Protonation of (Ph3P)(2)Pt[eta(2)-HC drop CC(CH3)=CH2] (2a) with excess HBF4 . Et2O produced the pi-allyl complex (Ph3P)(2)Pt[eta(3)- H2C=CC(CH3)=CH2]+BF4-(3a-BF4) instead of a pi-propargyl complex. Reaction of excess CF3CO2H with 2a initially produced the analogous pi-allyl complex 3a-CF3CO2 which then added CF3CO2H across the vinylidene unit of 3a-CF3CO2 to give the pi-allyl complex (Ph3P)(2)Pt[eta(3)-CH3C(CF3CO2) C(CH3)CH2]+CF3CO2-(5a). Protonation of the platinum diyne complex [(p-CH3-C6H4)(3)P](2)Pt(eta(2)- CH3C drop CC drop CCH3) (7b) with HBF4Et2O at -73 degrees C initially produced the platinum hydride complex trans-[(p-CH3-C6H4)(3)P](2)- PtH(eta(2)-CH3C drop CC drop CCH3)+BF4-(9), which rearranged to the platinum pi-propargyl complex [(p-CH3-C6H4)(3)P](2)Pt[eta(3)-(CH3CH=)-CC drop CCH3]+BF4-(11) at -28 degrees C. (C) 1997 Elsevier Science S.A.