The alkoxycarbonyl complexes Pd(Ph2Ppy)2(CO2R)(OAc) where Ph2Ppy is 2-pyridyldiphenylphosphine and R = Me 1, Et 2, i-Pr 3 have been prepared from Pd(OAc)2 and Ph2Ppy in ethanol solution under an atmosphere of CO. Increasing the CO pressure favours the formation of palladium carbonyl species. In the presence of 2 mol equivalents of CF3CO2H, the complex Pd(Ph2Ppy)2(CO2CH3)(CF3CO2) 4 is isolated from methanol. Pd(Ph2Ppy)2(CO2CH3)Cl 5 has been obtained by the reaction of Pd(Ph2Ppy)2Cl2 with NaOCH3 in the presence of CO. 1 and 5 have been crystallographicaly characterised as trans isomers, a geometry confirmed for all the complexes by 13C NMR. The reactivity of the complexes toward alkynes and propadiene has been investigated and the π-allyl complex [Pd(Ph2Ppy)2η3-C3H4C(CH3)CH2}][O2CCF3] 8 isolated and structurally characterised.
在CO气氛下,通过在
乙醇溶液中用Pd(OAc)2和Ph2Ppy反应,可以制备出烷氧基羰基化合物Pd(Ph2Ppy)2(CO2R)(OAc),其中Ph2Ppy是2-
吡啶基
二苯基膦,R = Me 1、Et 2、i-Pr 3。增加CO压力有利于形成羰基
钯物种。在2 mol等价的CF3CO2H存在下,可以从
甲醇中分离出Pd(Ph2Ppy)2(CO2 )(CF3CO2) 4的复合物。Pd(Ph2Ppy)2(CO2 )Cl 5是通过Pd(Ph2Ppy)2Cl2与NaO 在CO存在下的反应获得的。1和5在晶体学上被鉴定为反式异构体,通过13C NMR证实了所有复合物的几何结构。已经研究了复合物对炔和
丙二烯的反应性,并分离出π-烯丙基复合物[Pd(Ph2Ppy)2η3-C3H4C(
CH3)
CH2}][O2CCF3] 8,并对其结构进行了鉴定。