triphenylphosphane. The new complexes 3 and 4 as well as Co2(CO)7(PPh3), Co2(CO)6(PPh3)2, and Co2(CO)6 (dppm) (dppm = Ph2PCH2PPh2) were found to be suitable catalyst precursors in the selective carbonylation of ethyl diazoacetate to diethyl malonate in the presence of ethanol.
                                    的三苯基
磷烷取代衍
生物共2(CO)6(CHCO 2 ET)(PPH 3),[μ 2 - 乙氧羰基(亚甲基)} - μ 2 - (羰基) - (三
羰基钴) - (
三苯基膦二
羰基钴)(椰子)](3)和Co 2(CO)5(CHCO 2 ET)(PPH 3)2,[μ 2 - 乙氧基羰基- (亚甲基)} - μ 2 - (羰基) -双(
三苯基膦二羰-
钴(Co-Co)](4)由已知的Co 2(CO)7(CHCO 2 Et)(1)和Co 2(CO)6(CHCO 2 Et)2(2)与
三苯基膦的络合物。新的配合物3和4以及Co 2(CO)7(PPh 3),Co 2(CO)6(PPh 3)2和Co 2(CO)6(dppm)(dppm = Ph 2 PCH 2 PPh 2)被发现是在
乙醇存在下重氮乙基
乙酸乙酯选择性羰基化为
丙二酸二乙酯中的合适催化剂前体。