The preparation of imidazolidinone and oxazolidinone chelated carbene complexes
作者:Timothy S Powers、William D Wulff、John Quinn、Yan Shi、Weiqin Jiang、Richard Hsung、Mark Parisi、Annette Rahm、Xiao Wu Jiang、Glenn P.A Yap、Arnold L Rheingold
DOI:10.1016/s0022-328x(00)00734-8
日期:2001.1
these complexes. The imidazolidinone complexes are best prepared by adding an imidazolidinone or lithiated imidazolidinone to a methoxy carbenecomplex or to an in-situ generated acetoxy carbenecomplex. α,β-Unsaturated imidazolidinone complexes are prepared by aldol condensations of alkyl imidazolidinone complexes or by alkylaltion of these complexes with bromomethyl methyl ether and then elimination
(CO)4 M = CC(R 1)NCO(CHR 2 CHR 3 X)类型的几种内部螯合的咪唑啉酮和恶唑烷酮费希尔卡宾配合物的合成据报道,其中M =铬,钨;[R 1 =甲基,乙基,异丙基,苯基,反式-丙烯基,异丙烯基,异丁烯基,环己烯基和1-丙炔基; R 2= H,Ph,Bn,Me,Cy;R 3= H,我,Ph;X = O,NMe。四种不同的方法用于合成这些配合物。最好将咪唑烷酮或锂化的咪唑烷酮加入甲氧基卡宾配合物或原位生成的乙酰氧基卡宾配合物中来制备咪唑烷酮配合物。α,β-不饱和咪唑烷酮配合物是通过烷基咪唑烷酮配合物的羟醛缩合或通过将这些配合物与溴代甲基甲醚烷基化,然后除去甲醇而制备的。最佳的恶唑烷酮配合物是通过两步程序制备的,该过程包括向甲氧基或乙酰氧基配合物中添加β-氨基醇,然后用光气将所得的氨基卡宾配合物封闭到恶唑烷酮配合物中。
Synthesis of electron donor–acceptor polyunsaturated methylenepyran Fischer type carbene complexes: dynamic 1H-NMR study and solvatochromic properties
作者:F Robin-Le Guen、P Le Poul、B Caro、R Pichon、N Kervarec
DOI:10.1016/s0022-328x(00)00940-2
日期:2001.4
Condensation of α and γ methylenepyran aldehydes with the Fischer carbene complexes (CO)5MC(OCH3)Me (M=Cr, W) or (CO)5WC(OCH3)CHCH–CH3 in the presence of ClSiMe3/NEt3 yield donor acceptor complexes, in which the electron donating group is connected to the organometallic accepting group by a conjugated ethylenic spacer. 1H- and 13C-NMR studies, suggest that the carbene fragment and the unsaturated chain lie
Synthesis and x-ray structures of some homonuclear μ-alkylidenetungsten complexes
作者:A. Parlier、M. Rudler、H. Rudler、J.C. Daran
DOI:10.1016/0022-328x(87)80430-8
日期:1987.4
from conjugated Fischer-typ carbenecomplexes (CO)5WC(OR)CHCHR. The X-ray structure of the complex W2μ-C(OEt)CHCH(CH3)][(CO)9]} has also been determined. In the case of the simplest conjugated compelx (CO)5WC(OR)CHCH2, an interesting rearrangement initiated by addition of W(CO)5 to the terminal CC double bond giving a dinuclear complex W(CO)5[η2-CH2CHC(OMe)W(CO)5] in which the two metal centers
A one-step synthesis of alkenyl-, dienyl- and trienyl-idene complexes of chromium and tungsten carbonyl
作者:Hubert Le Bozec、Christophe Cosset、Pierre H. Dixneuf
DOI:10.1039/c39910000881
日期:——
Alkenyl-, dienyl- and trienylidene-chromium and tungsten complexes (CO)5M = [C(OMe)CH = CH-(CH = CH)n-R}] [n = 0, 1,2] are produced in one step by photolysis of M(CO)6 [M = Cr, W] in the presence of 2-propyn-1-ol derivatives H-C = CC(H)(OH)[CH = CH)n-R] and methanol.
Exo-selective Diels-Alder reactions of aminocarbene complexes
作者:Benjamin A. Anderson、William D. Wulff、Timothy S. Powers、Sandra Tribbitt、Arnold L. Rheingold
DOI:10.1021/ja00053a015
日期:1992.12
The first examples of intermolecular Diels-Alder reactions of aminocarbene complexes are described. Various members of both the alkylamino and acylamino families of complexes are investigated. The E-isomer of [tran-propenyl(methylamino)methylene]pentacarbonyltungsten (22) will react with Danishefsky's diene and 1-methoxy-1,3-butadiene, but the Z-isomer will not. The yields are good only for the more