新的膦钯配合物的合成、表征及其催化氢化性能

Abstract

等摩尔的Pd（CH3Cn）2Cl2与邻-二苯基膦苯甲醛在乙醇中回流反应，生成了缩醛化膦配体配位的钯氯化物PdCl2｛PH2P［O-C6H4CH（OC2H5）2］｝2（I）.双亚胺双膦配体n，n′-双-［邻-（二苯基膦）苯亚甲基］乙二胺（简称P2n2）与1或2摩尔的Pd（CH3Cn）2Cl2在二氯甲烷中回流反应，分别高产率地制得PdCl2（P2n2）（I）和Pd2Cl2（P2n2）（II）.进行了元素分析、谱学表征或X射线结构分析.考察了这些配合物催化苯乙烯和丙烯酸的氢化.双核的钯配合物Pd2Cl2（P2n2）发挥了最高活性.

The interaction of Pd(CH_3CN)_2Cl_2 and one equivalent of o(diphenylphosphino)benzaldehyde in refluxing ethanol gives transPdCl_2{Ph_2P(O-C_6H_4CH(OC_2H_5)_2)}_2 (I) in moderate yield.Mononuclear palladium complex PdCl_2(P_2N_2) (Ⅱ) could be prepared on high yield via the interaction of Pd(CH_3CN)_2Cl_2 and one equivalent of N, N′-bis(O-(diphenylphosphino) benzylidene)ethylenediamine(P_2N_2 for short) in refluxing dichloromethane.If two equivalent of Pd(CH_3CN)_2Cl_2 is used, a new dinuclear palladium complex Pd_2Cl_2(P_2N_2) (Ⅲ) will be formed.Complexes IIII have been fully characterized by elementary analysis and spectroscopic methods.The structure of complex I has been established by an Xray diffraction study.The complexes IIII as catalyst for homogeneous hydrogenation of styrene and acrylic acid have been investigated and the results indicate the dinuclear complex III is more effective catalyst.