glycolato)diboron). X-ray diffraction and DFT calculations strongly suggest that a delocalized, multicenter bonding scheme dictates the bonding situation of the NiB2 moiety in these square planar complexes, reminiscent of the bonding situation of “non-classical” H2 complexes. [Ni(iPr2ImMe)2] also efficiently catalyzes the diboration of alkynes using B2cat2 as the boron source under mild conditions. In
第一个
镍双
硼络合物顺式-[Ni( i Pr 2 Im Me ) 2 (Bcat) 2 ],顺式-[Ni( i Pr 2 Im Me ) 2 (Bpin) 2 ] 和顺式-[Ni( i Pr 2 Im Me ) 2 (Beg) 2 ] 是通过[Ni( i Pr 2 Im Me ) 2 ]源与二
硼 (4) 化合物 B 2反应制备的cat 2 , B 2 pin 2 and B 2 eg 2 ( i Pr 2 Im Me = 1,3-di-iso-propyl-4,5-dimethylimidazolin-2-ylidene; B 2 cat 2 = bis(catecholato)diboron; B 2针2 = 双(
频哪醇)二
硼;B 2例如2 = 双(
乙二醇)二
硼)。X 射线衍射和 DFT 计算强烈表明,离域的多中心键合方案决定了这些方形平面复合物中 NiB 2部分的键合情况,让人联想到“非经典”H