<i>N</i>-Methylacridinium Salts: Carbon Lewis Acids in Frustrated Lewis Pairs for σ-Bond Activation and Catalytic Reductions
作者:Ewan R. Clark、Michael J. Ingleson
DOI:10.1002/anie.201406122
日期:2014.10.13
N‐methylacridinium salts are Lewis acids with high hydride ion affinity but low oxophilicity. The cation forms a Lewis adduct with 4‐(N,N‐dimethylamino)pyridine but a frustrated Lewis pair (FLP) with the weaker base 2,6‐lutidine which activates H2, even in the presence of H2O. Anion effects dominate reactivity, with both solubility and rate of H2 cleavage showing marked anion dependency. With the optimal
Silylative reduction of nitriles was studied under transition metal-free conditions by using B(C6F5)3 as a catalyst with hydrosilanes as a reductant. Alkyl and (hetero)aryl nitriles were efficiently converted to primaryamines or imines under mild conditions. The choice of silanes was found to determine the selectivity: while a full reduction of nitriles was highly facile, the use of sterically bulky
在无过渡金属的条件下,通过使用B(C 6 F 5)3作为催化剂,以氢硅烷作为还原剂,研究了腈的甲硅烷基化还原反应。在温和的条件下,烷基和(杂)芳基腈被有效地转化为伯胺或亚胺。发现硅烷的选择决定了选择性:虽然腈的完全还原非常容易,但是使用空间大体积的硅烷允许部分还原,从而生成N-甲硅烷基亚胺。
Homobimetallic Rhodium NHC Complexes as Versatile Catalysts for Hydrosilylation of a Multitude of Substrates in the Presence of Ambient Air
作者:Aron J. Huckaba、T. Keith Hollis、Sean W. Reilly
DOI:10.1021/om400452q
日期:2013.11.11
di-Rh complexes based on 1,3-bis(3′-butylbenzimidazol-2′-ylidene)benzene were utilized as catalysts for hydrosilylation. Among the substrates investigated were aldehydes, ketones, α,β-unsaturated carbonyls, acyl chlorides, nitriles, alkenes, nitro groups, isocyanates, and tertiary amides. Additionally, carbon dioxide underwent hydrosilylation to produce dimethylphenylsilylformate. The catalysts compared
Selective Double Hydrosilylation of Nitriles Catalyzed by an Iron Complex Containing Indium Trihalide
作者:Masaki Ito、Masumi Itazaki、Hiroshi Nakazawa
DOI:10.1002/cctc.201600940
日期:2016.11.8
amount of triirondodecacarbonyl [Fe3(CO)12] and indiumtrichloride (InCl3). This reaction was also catalyzed by an iron complex containing indium trihalide [Fe(MeCN)6][Fe(CO)4(InX3)2], prepared by the reaction of Fe3(CO)12 with InX3 (X=Cl, Br, I). This is a novel report of the combination of a transition‐metal complex and an indium source in organic synthesis.