Synthesis and structural chemistry of N-{2-(arylthio/seleno)ethyl}morpholine/piperidine–palladium(II) complexes as potent catalysts for the Heck reaction
作者:Pradhumn Singh、Dipanwita Das、Om Prakash、Ajai K. Singh
DOI:10.1016/j.ica.2012.07.029
日期:2013.1
Abstract The reactions of in-situ generated PhS − , PyS − and PhSe − with 4-(2-chloroethyl)morpholine hydrochloride and 1-(2-chloroethyl)piperidine hydrochloride in N 2 atmosphere have resulted in N -2-(arylchalcogeno)ethyl}morpholine/piperidine ligands ( L1 − L6 ), which on reaction with Na 2 PdCl 4 at room temperature result in complexes of composition [PdCl 2 ( L )] ( 1 – 6 ; L = L1 − L6 ). All
摘要在N 2气氛下原位生成的PhS-,PyS-和PhSe-与4-(2-氯乙基)吗啉盐酸盐和1-(2-氯乙基)哌啶盐酸盐的反应导致了N-2-(芳基硫属元素基) )乙基}吗啉/哌啶配体(L1-L6),在室温下与Na 2 PdCl 4反应时,会形成[PdCl 2(L)]组成的配合物(1-6; L = L1-L6)。除2以外的所有配合物均已通过X射线晶体学表征。在所有情况下,Pd周围的几何形状几乎都是正方形平面。Pd-S和Pd-Se键长分别在2.2598(10)-2.2795(14)和2.3541(6)-2.3632(15)A范围内。在具有L5和L6(Se配体)的Pd(II)配合物的77 Se 1 H} NMR光谱中,相对于相应的游离配体而言,信号出现的频率更高(最高187 ppm)。钯(II)-络合物(2,已经发现4和6)对于芳基溴化物与丙烯酸甲酯的Heck反应是有希望的。TON值高达18 200,TOF高达758