本文研究了酰烯醇钴( III )氢化物[Co III (O∩CO)(PMe 3 ) 3 H] (O∩CO = 酰烯醇配体) 1–3对烯烃氢化硅烷化的催化性能。实验结果表明,三种氢化钴( III )对烯烃的硅氢加成反应表现出优异的催化活性。氢化物1的催化效果优于配合物2或3。该催化体系具有良好的底物通用性和较高的选择性。催化条件(1小时,50℃)温和。芳香族烯烃和烷基烯烃分别生成马尔可夫尼科夫产物和反式-马尔可夫尼科夫产品具有 99% 的选择性。在催化机理的研究中,氢化钴( III )与硅烷反应生成的甲硅烷基钴( III )中间体被认为是真正的催化剂。根据实验信息和文献报告提出了催化机制。
meridional configuration in the crystal. In solution a η2-nitrophenolato coordination mode is usually attained after dissociation of one of the trimethylphosphines resulting in cis and trans isomers of bis(phosphine) compounds 2 and 3. bis(Phosphine) complexes 5–7 (cis, trans) were also obtained from Co(η2-CO,O)H(PMe3)3 (CO,O-1-carbonyl-2-oxo-3,4-benzo-cyclohexendiy1; 1-carbonyl-2-oxo-1,2-diphenyl-ethendiyl)
Reaction of the Acyl(hydrido)cobalt(III) Complex with 2-Propyn-1-ol
作者:Lei She、Hongjian Sun、Xiaoyan Li
DOI:10.1002/zaac.200700206
日期:2007.10
Acyl(hydrido)cobalt(III) complexes mer-[CoIII(O∩C=O)(H)(PMe3)3] (1 and 2) stabilized by 2-acylphenolato-chelating ligands and with the support of trimethylphosphine react with 2-propyn-1-ol to generate inserting products of alkyne bond into Co-H bond bearing bis-chelating vinyl cobalt(III) complexes cis-[CoIII(O∩C=O)(HO∩C=CH2)(PMe3)2] (3 and 4). In complexes 3 and 4 the vinyl chelating ligands form
Novel stable five-coordinate diorgano cobalt(III) complexes: Formation, structure, and reaction with carbon monoxide
作者:Xiaoyan Li、Fengli Yu、Hongjian Sun、Haoqing Hou
DOI:10.1016/j.ica.2006.03.029
日期:2006.7
A series of new five-coordinate acyl vinyl cobalt(III) complexes Coeta(1)-C(C CPh)=CHPh}[C(O)-C=C-O]L-2(L=PMe3) (6-10) were prepared via formal insertion of diphenylbutadiyne into Co-H function of mer-octahedral hydrido-acyl(phenolato)-cobalt(III) complexes. The complexes are diamagnetic. One square pyramidal structure of complex 6 was confirmed by X-ray diffraction analysis. These complexes are stable in solid state. In solution, six-coordinate acyl vinyl carbonyl cobalt(III) complex 11 is approved through the reaction of complex 7 with CO and the structure of complex 11 was determined by X-ray method. (c) 2006 Elsevier B.V. All rights reserved.
Reaction of acyl(hydrido)cobalt(III) complexes with (2-diphenylphosphanyl)thiophenol and the influence of chelating ligands containing hard/soft donor atoms on the stability of cobalt complexes
作者:Hongjian Sun、Lei She、Shimin Fang、Xiaoyan Li
DOI:10.1016/j.poly.2007.11.010
日期:2008.2
The reaction of acyl(hydrido)cobalt(III) complexes Co-III (O boolean AND C=O)(H)(PMe3)(3) (1-5) with (2-diphenylphosphanyl)thiophenol afforded four types of complexes Co-III (O boolean AND C=O)(P boolean AND S)(PMe3)(2) (6-7), Co-III (O boolean AND C=O)(O boolean AND OHC)(2) (11-15), Co-III (P boolean AND S)(PMe3)(3) (16), and Co-II (P boolean AND S-2)(PMe3) (17). A mechanism for the formation of these complexes is proposed. The influences of chelating ligands containing hard/soft donor atoms on the stability of the cobalt complexes in different oxidation states are discussed with respect to the HSAB concept. (c) 2007 Elsevier Ltd. All rights reserved.