The chemistry of η5-CpCo(CO)(maleoyl) and η5-CpCo(CO)(phthaloyl) complexes
作者:Lanny S. Liebeskind、Charles F. Jewell
DOI:10.1016/0022-328x(85)87376-9
日期:1985.4
Insertion of η5-CpCo(CO)2 into dimethylcyclobutenedione and benzocyclobutenedione gave high yields of η5-CpCo(CO)(dimethylmaleoyl) and η5-CpCo(CO)(phthaloyl); respectively. Replacement of the carbonmonoxide ligand in these complexes with thermally labile ligands (CH3CN, PhCN, C5H5N, (C2H5)2S) allowed a facile reaction with alkynes to occur. The maleoyl cobalt complex gave very high yields of stable
的η插入5 -CpCo(CO)2成dimethylcyclobutenedione和benzocyclobutenedione给出的η高收率5 -CpCo(CO)(dimethylmaleoyl)和η 5 -CpCo(CO)(邻苯二甲酰基); 分别。用热不稳定的配体(CH 3 CN,PhCN,C 5 H 5 N,(C 2 H 5)2 S)取代这些配合物中的一氧化碳配体可以轻松地与炔烃反应。所述马来酰钴络合物,得到稳定的非常高的产率η 5,其裂解以游离醌治疗用铈(IV)-CpCo(醌)络合物。邻苯二甲酰钴络合物反应形成不稳定的η5- CpCo(萘醌)配合物和游离萘醌。
Alkyne Competition in the Benzannulation Reaction with Chromium Carbene Complexes
作者:Chunrui Wu、Dmytro O. Berbasov、William D. Wulff
DOI:10.1021/jo100433k
日期:2010.7.2
The benzannulation reaction of Fischer carbenecomplexes is investigated under conditions where the reaction of the carbenecomplex is occurring in the presence of two different alkynes. A series of competition experiments are examined where the effects of various structural factors are explored by pitting 10 different carbenecomplexes with 11 different alkynes. Terminal alkynes will react selectively
Photocycloaddition Reaction of Alkyl-substituted 1,4-Naphthoquinones with Olefins. Substituent Effects on Controlling the Orientation of Cycloaddition Reaction
作者:Kazuhiro Maruyama、Noritsugu Narita
DOI:10.1246/bcsj.53.757
日期:1980.3
an arylsubstituted ethylene afforded 3,4-benzobicyclo[4.2.0]octene-2,5-dione derivatives (cyclobutane type adducts) in a good yield without any other types of products. The orientation of the cycloaddition was likely to control by the adverse van der Waals repulsion of the substituents of the quinone and olefin in addition to the electronic effects of the substituents. The predominant factor orientating
The development of an organotransition metal synthesis of quinones
作者:Lenny S. Liebeskind、Sherrol L. Baysdon、Michael S. South、Suresh Iyer、James P. Leeds
DOI:10.1016/s0040-4020(01)91423-1
日期:1985.1
A new and very general synthesis of quinones is described from conception to the current state of maturity. The chemistry relies on a convergent joining of a transition metalcomplex and an alkyne to provide benzoquinones (from maleoylmetal complexes) and naphthoquinones (from phthaloylmetal complexes). Significant aspects of this chemistry are its generality (terminal, internal, electron rich, and
The Preparation and Evaluation of Electron Poor Benzylidene Fischer Carbene Complexes: Studies Toward the Total Synthesis of (+)-Olivin
作者:Vincent P. Liptak、William D. Wulff
DOI:10.1016/s0040-4020(00)00867-x
日期:2000.12
the benzannulationreaction is put forth using the electronic nature of substituents on the aryl ring of benzylidene Fischer carbene complexes as a handle to predict, using σ-para values as a guide, the outcome of the reaction based on the accepted mechanism. The design of this work focuses on evaluation of the synthetic utility of the benzannulationreaction and the means by which this reaction may