‘Pincer’ pyridine dicarbene complexes of nickel and their derivatives. Unusual ring opening of a coordinated imidazol-2-ylidene
作者:David Pugh、Aimee Boyle、Andreas A. Danopoulos
DOI:10.1039/b715769j
日期:——
The reaction of NiBr2(DME), DME = 1,2-dimethoxyethane, with the ‘pincer’ pyridine dicarbene ligands (C-N-C) (2) and (C-NMe-C) (2Me), (C-N-C = 2,6-bis-[(DiPP)imidazol-2-ylidene]pyridine, C-NMe-C = 2,6-bis-[(DiPP)imidazol-2-ylidene]-3,5-dimethylpyridine, DiPP = 2,6-diisopropylphenyl) gave the square planar complexes [Ni(C-N(Me)-C)Br]Br, 3·(Br)− and 3MeMe·(Br)− respectively. Transmetallation from [(C-NMe-C)2Ag2](Ag6I8)
NiBr 2(DME)的反应二甲醚 = 1,2-二甲氧基乙烷,加上“钳子” 吡啶 二卡宾 配体(CNC)(2)和(CN Me -C)(2 Me),(CNC = 2,6-双-[(DiPP)咪唑-2-亚甲基]吡啶,CN Me -C = 2,6-双- [(DIPP)咪唑-2-亚基] -3,5-二甲基吡啶,磷酰化= 2,6-二异丙基苯基),得到正方形的平面配合物[镍(CN (Me)的-C)BR] BR,3 ·(溴)-和3 Me Me ·(Br)-。重金属化由[(CN Me -C)2 Ag 2 ](Ag 6 I 8),6 Me Me ·(Ag 6 I 8)2-到NiBr 2(DME),得到[Ni(CN Me -C)Br](AgI 2),3 Me Me ·(AgI 2)−。的反应3 ·(溴)-与KPF 6导致仅在离子溴化物的交换,然而的反应3 ·(溴)-用的AgBF 4在MeCN或的AgOTf在THF
Catalytic Hydrogenation Activity and Electronic Structure Determination of Bis(arylimidazol-2-ylidene)pyridine Cobalt Alkyl and Hydride Complexes
作者:Renyuan Pony Yu、Jonathan M. Darmon、Carsten Milsmann、Grant W. Margulieux、S. Chantal E. Stieber、Serena DeBeer、Paul J. Chirik
DOI:10.1021/ja406608u
日期:2013.9.4
for the catalytic hydrogenation of alkenes. At 22 °C and 4 atm of H2 pressure, ((iPr)CNC)CoCH3 is an effective precatalyst for the hydrogenation of sterically hindered, unactivated alkenes such as trans-methylstilbene, 1-methyl-1-cyclohexene, and 2,3-dimethyl-2-butene, representing one of the most active cobalt hydrogenation catalysts reported to date. Preparation of the cobalt hydride complex, ((iPr)CNC)CoH
Stable N-functionalised ‘pincer’ bis carbene ligands and their ruthenium complexes; synthesis and catalytic studies
作者:Andreas A. Danopoulos、Scott Winston、William B. Motherwell
DOI:10.1039/b202814j
日期:2002.6.19
Deprotonation of 2,6-bis(arylimidazolium)pyridine dibromide with KN(SiMe3)2 gave thermally stable 2,6-bis(arylimidazol-2-ylidene)pyridine, which was further used to prepare ruthenium ‘pincer’ complexes; the latter show catalytic activity in transfer hydrogenation of carbonyl compounds.
“Pincer” Pyridine–Dicarbene–Iridium and ‐Ruthenium Complexes and Derivatives Thereof
作者:Andreas A. Danopoulos、Pierre Braunstein、Jörg Saßmannshausen、David Pugh、Joseph A. Wright
DOI:10.1002/ejic.202000429
日期:2020.9.22
experimental structures and rationalize their features. 1 undergoes oxidative transformations with CH2Cl2 to cis‐[IrIII(CNMeC)(CH2Cl)Cl2] (7) and with PhICl2 to mer‐[IrIII(CNMeC)Cl3] (8). The ruthenium derivatives trans‐[RuII(CNC)Cl2L] CNC = [2,6‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene]‐pyridine, L = pyridine, 10} and [RuII(CNC)(η2,η2‐nbd)](X)2 . 2L (nbd = 2,5‐norbornadiene, L = CH3CN, X = BF4 11), were
阳离子钳型配合物[Ir I(CN Me C)L] X CN Me C = [2,6-双(2,6-二异丙基苯基)咪唑-2-亚基] -3,5-二甲基吡啶,L = CO,X = PF 6 4;L = CH 3 CN,X = PF 6 5;L =吡啶,X = BAr F 4,Ar F = 3,5-双三氟甲基-苯基6 },是通过置换氯配体从[Ir I(CN Me C)Cl](1)中获得的表征。配合物4和5采用方形平面,面内扭曲几何形状,而在6中金属环境呈显着的金字塔形。4和6中阳离子的理论计算重现了实验结构并使其特征合理化。1层进行氧化,用CH变换2氯2至顺式- [铱III(CN我C)(CH 2 Cl)的氯2 ](7)中并用PhICl 2至聚体-的[Ir III(CN我C)氯3 ](8)。钌衍生物反式[Ru II(CNC)氯2 L] CNC = [2,6-双(2,6-二异丙基苯基)咪唑-2-亚基]
Synthesis, Structure, and Hydrogenolysis of Pyridine Dicarbene Iron Dialkyl Complexes
作者:Stephan M. Rummelt、Jonathan M. Darmon、Renyuan Pony Yu、Peter Viereck、Tyler P. Pabst、Zoë R. Turner、Grant W. Margulieux、Shunlin Gu、Paul J. Chirik
DOI:10.1021/acs.organomet.9b00382
日期:2019.8.26
for the synthesis of bis(imidazol-2-ylidene)pyridine iron dialkyl complexes, (CNC)Fe(CH2SiMe3)2, have been developed. The first route consists of addition of 2 equiv of LiCH2SiMe3 to the iron dihalide complex (CNC)FeBr2, while the second relies on addition of the free CNC ligand to the readily prepared (py)2Fe(CH2SiMe3)2 (py = pyridine). With aryl-substituted CNC ligands, octahedral complexes of the