Preparation, Structures, and Thermal Reactivity of Alkoxycarbonyl(cyano)palladium(II) Complexes <i>trans</i>-Pd(COOR)(CN)(PPh<sub>3</sub>)<sub>2</sub> (R = Me, Et, <i><sup>n</sup></i>Pr, <i><sup>i</sup></i>Pr, <i><sup>n</sup></i>Bu, <i><sup>t</sup></i>Bu, and Bn) as Intermediates of the Palladium-Catalyzed Cyanoesterification of Norbornene Derivatives
作者:Yasushi Nishihara、Mitsuru Miyasaka、Yoshiaki Inoue、Tomoka Yamaguchi、Masaaki Kojima、Kentaro Takagi
DOI:10.1021/om700343y
日期:2007.7.30
complexes trans-Pd(COOR)(CN)(PPh3)2 (1, R = Me; 2, R = Et; 3, R = nPr; 4, R = iPr; 5, R = nBu; 6, R = tBu; 7, R = Bn) are prepared via oxidative addition of the corresponding cyanoformates to Pd(PPh3)4 in toluene at room temperature or 50 °C and characterized by means of NMR (1H, 13C1H}, and 31P1H}) and IR spectroscopy as well as elemental analyses. X-ray crystallography of 3, 4, and 6 showed a square-planar
烷氧羰基(氰基)钯(II)配合物反式-Pd(COOR)(CN)(PPh 3)2(1,R = Me; 2,R = Et; 3,R = n; 4,R = i; 5,R = n卜; 6,R =吨卜; 如图7所示,R = Bn)是通过在室温或50°C下于甲苯中将相应的氰基甲酸酯氧化添加到Pd(PPh 3)4中制备的,并通过NMR(1 H,13 C 1 H}和31 P 1 H})和IR光谱以及元素分析。的X射线晶体3,4,和6显示周围被结合到烷氧基羰基和氰基配体在所述的Pd中心的正方形平面协调反式构型。将Pd-CN和Pd-COOR债券1,3,4,和6与迄今报道的氰基钯(II)和烷氧基羰基钯(II)配合物的那些相似。在Pd(PPh 3)4与氰基甲酸苯酯反应后,发生热诱导的配体交换,从而生成双氰基钯(II)配合物,即反式-Pd(CN)2(PPh 3)2(8)。配合物2能够催化降冰片二烯与氰基甲酸乙酯反应生成(2