Rhodium(I)‐NHC Complexes Bearing Bidentate Bis‐Heteroatomic Acidato Ligands as
<i>gem</i>
‐Selective Catalysts for Alkyne Dimerization
作者:María Galiana‐Cameo、Marina Borraz、Yaroslava Zelenkova、Vincenzo Passarelli、Fernando J. Lahoz、Jesús J. Pérez‐Torrente、Luis A. Oro、Andrea Di Giuseppe、Ricardo Castarlenas
DOI:10.1002/chem.202001584
日期:2020.8.3
acidato ligands (BHetA) including carboxylato (O,O), thioacetato (O,S), amidato (O,N), thioamidato (N,S), and amidinato (N,N), have been prepared by reaction of the dinuclear precursor [Rh(μ‐Cl)(IPr)(η2‐coe)]2 with the corresponding anionic BHetA species. The RhI‐NHC‐BHetA compounds catalyze the dimerization of aryl alkynes, showing excellent selectivity for the head‐to‐tail enynes. Among them, the acetanilidato‐based
一系列的Rh(κ 2 -BHetA)(η 2 -COE)(IPR)配合轴承1,3-双- hetereoatomic acidato配体(BHetA)包括羧酸根(O,O),thioacetato(O,S),amidato( O,N),thioamidato(N,S),和amidinato(N,N),已经制备了由双核前体的反应的[Rh(μ -Cl)(IPR)(η 2 -COE)] 2与相应的阴离子BHetA物种。Rh I -NHC-BHetA化合物催化芳基炔烃的二聚化,对头尾烯炔烃具有出色的选择性。其中,基于乙酰苯胺基的催化剂表现出出色的催化性能,达到了前所未有的2500 h -1的TOF水平。对宝石异构体具有完全的选择性。反应机理的研究支持非氧化途径,其中通过中间的BHetA配体表现为质子梭κ 1 -HBHetA物种。但是,在吡啶作为添加剂的情况下,常见Rh III H(C≡CPh)2(IP