New alkoxycarbonyl complexes of palladium (II) and their role in carbonylation reactions carried out in the presence of an alkanol
作者:R. Bertania、G. Cavinato、L. Toniolol、G. Vasapollo
DOI:10.1016/0304-5102(93)85049-y
日期:1993.10
2-ethoxyethyl, cyclopentyl, cyclohexyl; L = 1,2-diphenylphosphinoethane, R = Et) are prepared by reacting trans-PdCl2L2, suspended in an alkanol, under 10–50 atm of carbon monoxide, at 50–70°C, in presence of a base such as a trialkylamine or a carboxylic acid anion. They have been characterized by IR, 1H and 31P NMR spectroscopy. The complexes with RMe and Et show two absorption bands centered at
通式的新的复合物的反式-Pd(COOR)CLL 2(L = PPH 3,R =的Et,Ñ -Pr,异-Pr,Ñ -Bu,异-Bu,仲丁基-Bu,2-乙氧基乙基,环戊基,环己基; L = 1,2-二苯基膦乙烷,R = Et)是通过在50–70°C下,在10–50 atm一氧化碳下,将悬浮在烷醇中的反式-PdCl 2 L 2在50–70°C下反应制得的。碱,例如三烷基胺或羧酸根阴离子。它们的特点是IR,1 H和311 H NMR光谱。与RMe和Et的配合物显示出两个吸收带,中心在约1。1650 cm -1,这可能是由于具有顺式和反式几何结构的构象异构体。另一个仅在ca处显示一个波段。1650厘米-1。所有单膦配合物的1 H NMR和31 P NMR光谱显示溶液中仅存在一种异构体。相反,对于二膦乙氧基羰基配合物,11 H NMR光谱表明存在两种异构体,其比例为约1∶1。由去耦实验证实为1:1。