Synthesis and Reactivity of Ru(NHC)(dppp)(CO)H
<sub>2</sub>
and Ru(NHC)(dppp)(CO)HF Complexes: C–H and C–F Activation
作者:Steven P. Reade、Aaron L. Acton、Mary F. Mahon、Thomas A. Martin、Michael K. Whittlesey
DOI:10.1002/ejic.200801105
日期:2009.5
fluorido ruthenium(II) complex [Ru(PPh3)(dppp)(CO)HF] [1, dppp = 1,4-bis(diphenylphosphanyl)propane], which forms upon reaction of [Ru(PPh3)3(CO)HF] with dppp, reacts with IMes [1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene] to give the expected carbene-containing hydrido fluorido complex [Ru(IMes)(dppp)(CO)HF] (2), as well as the C–Hactivated species [Ru(IMes)′(dppp)(CO)H] (3). The formation of
N-Heterocyclic Carbene–Carbodiimide (“NHC–CDI”) Adduct or Zwitterionic-Type Neutral Amidinate-Supported Magnesium(II) and Zinc(II) Complexes
作者:Ashim Baishya、Lokesh Kumar、Milan Kr. Barman、Himansu S. Biswal、Sharanappa Nembenna
DOI:10.1021/acs.inorgchem.7b00879
日期:2017.8.21
5-dimethylimidazolium-2-N,N′-bis(2,6-diisopropylphenyl)amidinate} (LDipp) upon treatment with lithium bis[(trimethylsilyl)amide], LiN(SiMe3)2}, affords the NHC–lithium complex MeIEt–[LiN(SiMe3)2}]2 (6), in which one molecule of NHC (MeIEt = 1,3-diethyl-4,5-dimethylimidazol-2-ylidene) coordinates to one of the two lithium centers. In a similar way, the reaction between LDipp and MgN(SiMe3)2}2 allowed the formation
L 4- t BuPh –M N(SiMe 3)2 } 2 [M = Mg(1)and Zn(2); L 4- t BuPh = 1,3-二乙基-4,5-二甲基咪唑-2-(N,N'-双(4-叔丁基苯基)ami啶}},L 4- i PrPh –M N(SiMe 3)2 } 2 [M = Mg(3)和Zn(4);L 4- i PrPh= 1,3-二乙基-4,5-二甲基咪唑鎓-2- N,N'-双(4-异丙基苯基)ami酰胺}},以及带有两性离子型中性a酰胺的L 4- i PrPh –ZnEt 2(5)或有N-杂环卡宾-碳二亚胺(“ NHC-CDI”)加合物和单阴离子酰胺或烷基配体的报道。化合物的合成1 - 5是通过直接加入一个“NHC-CDI”加合物到对应的金属双(酰胺)或二烷基试剂来实现的。所有化合物1 - 5作为单体以固态形式存在。在所有情况下,金属(镁或锌)中心采用扭曲的四坐标四面体几何形状,键合到一个N,N
Reversible Intramolecular Alkyl C−H Bond Activation, Alcohol Dehydrogenation, and Trans−Cis Dihydride Isomerization in Ruthenium N-Heterocyclic Carbene Complexes
作者:Suzanne Burling、Mary F. Mahon、Belinda M. Paine、Michael K. Whittlesey、Jonathan M. J. Williams
DOI:10.1021/om049498u
日期:2004.9.1
Thermolysis of Ru(IEt2Me2)(PPh3)2(CO)H2 (IEt2Me2 = 1,3-bis(ethyl)-4,5-dimethylimidazol-2-ylidene) in the presence of CH2CHSiMe3 results in C−Hactivation of an NCH2CH2−H bond; the process can be reversed by H2 or alcohols to give different isomers of the starting dihydride complex.
Synthesis and Reactivity of Ru(PPh<sub>3</sub>)<sub>3</sub>(CO)HF and the N-Heterocyclic Carbene Derivatives Ru(NHC)(PPh<sub>3</sub>)<sub>2</sub>(CO)HF
作者:Steven P. Reade、Devendrababu Nama、Mary F. Mahon、Paul S. Pregosin、Michael K. Whittlesey
DOI:10.1021/om070164p
日期:2007.7.1
The reaction of Ru(PPh3)3(CO)H2 with excess Et3N·3HF at elevated temperature affords the hydride fluoride complexRu(PPh3)3(CO)HF (1). This reacts with a series of N-heterocyclic carbenes (NHCs) at ambient temperature to form the mono-NHC products Ru(NHC)(PPh3)2(CO)HF (NHC = IMe4 (2), IEt2Me2 (3), ICy (4), IiPr2Me2 (5)). Complexes 2−4 convert from the trans- to cis-phosphine isomers in solution over
Ru(PPh 3)3(CO)H 2与过量的Et 3 N·3HF在高温下反应,得到氢化物氟化物络合物Ru(PPh 3)3(CO)HF(1)。它在环境温度下与一系列N杂环卡宾(NHC)反应形成单NHC产物Ru(NHC)(PPh 3)2(CO)HF(NHC = IMe 4(2),IEt 2 Me 2(3),ICy(4),I i Pr 2 Me 2(5))。配合物2- 4从反式转换成顺式-异构体膦在溶液中在几周(相对速率2 > 3 » 4) ,而5所经历两个异构化和歧化,得到顺式-Ru(I我镨2我2)(PPH 3)2(CO)HF(6),1,和Ru(I我镨2我2)2(PPH 3)(CO)HF(7在几个小时内)。化合物的分子结构1 - 4 已经通过X射线晶体学确定。
Comparison of the photochemistry of organometallic N-heterocyclic carbene and phosphine complexes of manganese
作者:Madeeha Batool、Thomas A. Martin、M. Abu Naser、Michael W. George、Stuart A. Macgregor、Mary F. Mahon、Michael K. Whittlesey
DOI:10.1039/c1cc14467g
日期:——
Time-resolved IR (TRIR) studies on (η5-C5H4Me)Mn(L)(CO) (L = 1,3-diethyl-4,5-dimethylimidazol-2-ylidene, PPh3) indicate that the rate of reaction with CO is ca. 102 slower for the N-heterocyclic carbene intermediate, which DFT calculations suggest is due to the presence of a strong Mn⋯H–C agostic bond. The reactivity of these intermediates in alkane solvents is governed by such interactions rather than solvent coordination to the unsaturated metal centre.