Synthesis, characterization and catalytic application of some novel PNP-Ni(II) complexes: Regio-selective [2+2+2] cycloaddition reaction of alkyne
作者:Masilamani Tamizmani、Chinnappan Sivasankar
DOI:10.1016/j.jorganchem.2017.02.039
日期:2017.9
We have also performed alkyne [2+2+2] cycloaddition reaction using Ni(II) complexes and observed high regioselectivity of the products. The observed selectivity is well correlating with the electronic feature of alkynes. The [2+2+2] cycloaddition of electron rich alkynes produced 1,3,5-substituted benzene derivatives as a major product whereas the electron deficient alkynes produced 1,2,4-substituted
PN(H)P Ph,PN(Me)P iPr和PN(Me)P tBu配体的一些新颖的Ni(II)配合物已通过标准的分析和光谱方法(例如1 H NMR,31 P NMR,元素分析,ESI-MS,紫外可见光谱和单晶X射线晶体学。在三氟甲磺酸银存在下,复合物[PN(H)P Ph NiCl] 2 NiBr 4 (5)在室温下激活二氯甲烷的C-Cl键,得到复合物[PN(H)P Ph NiCl] OTf (6)。我们还使用Ni(II)配合物进行了炔烃[2 + 2 + 2]环加成反应,并观察到了产物的高区域选择性。观察到的选择性与炔烃的电子特征很好地相关。富电子炔烃的[2 + 2 + 2]环加成反应生成1,3,5-取代的苯衍生物作为主要产物,而缺电子炔烃则生成1,2,4-取代的苯衍生物作为主要产物。