摘要:
The alkynyl-alkenyl complex Os(C2CO2CH3){CH=CHC(O)OCH3}(CO)((PPr3)-Pr-i)(2) (2) reacts with HCl to give the butadienyl derivative Os{C(CH=CHCO2CH3)=CHC(O)OCH3}Cl(CO)((PPr3)-Pr-i)(2) (3), which can be also obtained by protonation of 2 with HBF4. OEt2 to give [Os{CH=CHC(O)CH3}(C=CHCO2CH3)(CO)((PPr3)-Pr-i)(2)]BF4 (4) and subsequent treatment of 4 with NaCl. The protonation of 3 with HBF4. OEt2 affords the alpha,beta-unsaturated carbene complex [Os{C(CH=CHCO2CH3)CH2C(O)OCH3}Cl(CO)((PPr3)-Pr-i)(2)]BF4 (5).