Syntheses, characterization, solution behavior and catalytic activity of trans-[(guanidine)2PdX2] (X = Cl and OC(O)R; R = Me, Ph and Bu) in Heck–Mizoroki coupling reactions involving chloroarenes/methyl acrylate
2·CHCl3, 3·C7H8 and 4 contain a pair of R11(8) rings stabilized by an intramolecular N–H⋯O hydrogen bond between the guanidine ligand and the carboxylate moiety. The influence of shape and size of the anion upon the stereochemistry of the complexes in the solidstate and in solution are discussed. VT 1H NMR spectroscopic studies carried out on samples of 1 and 3 revealed the presence of a mixture of two
摘要反式[((ArNH)2C NAr} 2PdX2](Ar = 2,5-Me2C6H3; X = Cl(1)和OC(O)R; R = Me(2),Ph(3)和tBu( 4))以高收率分离,并通过元素分析,IR和NMR(1H和13C)光谱进行了表征。上述配合物的分子结构通过单晶X射线衍射测定,揭示了反式反抗-反式(1·CHCl3),反式反抗-syn(2·CHCl3和3·C7H8)和反式反抗-(1·CHCl3)。 4)固态立体化学。配合物2·CHCl3、3·C7H8和4含有一对R11(8)环,该环通过胍配体和羧酸酯部分之间的分子内N–H = O氢键稳定。讨论了阴离子的形状和大小对固态和溶液中配合物的立体化学的影响。对1和3样品进行的VT 1H NMR光谱研究表明,溶液中存在两种旋转异构体的混合物,这是由于两种配体中胍配体的CN(H)Ar单键旋转受限制而产生的。配合物1-4被证明是活性催化剂,