A New Class of Remote N-Heterocyclic Carbenes with Exceptionally Strong σ-Donor Properties: Introducing Benzo[<i>c</i>]quinolin-6-ylidene
作者:Ulrich F. J. Mayer、Elliot Murphy、Mairi F. Haddow、Michael Green、Roger W. Alder、Duncan F. Wass
DOI:10.1002/chem.201203294
日期:2013.3.25
the case for benzo[c]quinolin‐6‐ylidene (1) as a strongly electron‐donating carbene ligand. The facile synthesis of 6‐trifluoromethanesulfonylbenzo[c]quinolizinium trifluoromethanesulfonate (2) gives straightforward access to a useful precursor for oxidative addition to low‐valent metals, to yield the desired carbene complexes. This concept has been achieved in the case of [Mn(benzo[c]quinolin‐6‐ylidene)(CO)5]+
我们以苯并[ c ]喹啉-6亚基(1)作为强供电子的卡宾配体为例。轻松合成6-三氟甲磺酰基苯并[ c ]喹啉三氟甲磺酸盐(2)可以直接获得有用的前体,用于氧化添加到低价金属中,从而生成所需的卡宾络合物。在[Mn(苯并[ c ]喹啉-6-亚基)(CO)5 ] +(15)和[Pd(苯并[ c ]喹啉-6-亚基)(PPh 3)2的情况下实现了这一概念(L)] 2+ L = THF(21),OTf(22)或吡啶(23)。试图与镍配位会导致两个卡宾前体片段的结合产物。锰化合物的CO IR拉伸频率数据表明,苯并[ c ]喹啉-6亚基至少是与报道的任何杂原子稳定的卡宾配体一样强的供体。