revealed cooperative metal-to-ketene ligand back-donation, although no interaction between the metal centers was detected. The bridgingketeneligand may be converted to variousC2 oxygenated functionalgroups via cationic oxycarbene complexes [M1—CH2C(OR)M2+], and consequently the ketene species may act as C2 templates in the actual catalytic reactions.
Studies on the abstraction of small molecules from organometallic compounds by Rh(PPh3)3Cl
作者:Erven J. Kuhlmann、John J. Alexander
DOI:10.1016/s0020-1693(00)94702-9
日期:1979.1
Abstract The synthetic utility of Rh(PPh 3 ) 3 Cl for the abstraction of small molecules from some cyclopentadienyl ironcarbonyl complexes is discussed with attention to mechanism. Terminal carbonyl and thiocarbonyl ligands are found to be removed preferentially. Experimental evidence suggests that the reaction proceeds by nucleophilic attack on the coordinated ligand by Rh(PPh 3 ) 2 Cl.
Oxidatively induced nucleophilic capture vs. degradation of cyclopentadienyl iron derivatives of simple carboxylic acids and of α-amino acids. A comparative study
作者:C. Amiens、G. Balavoine、F. Guibé
DOI:10.1016/0022-328x(93)80299-q
日期:1993.1
medium effects (especially the presence or absence of nucleophilic species). With simple carboxylic acid derivatives either homolytic dissociation (leading to alkyl radicals) or nucleophilic capture of the first-formed iron radical cations is observed, depending on the reaction conditions. With α-amino acid derivatives, an oxidative degradation to aldehyde is observed invariably, which is likely to
Manganese- and Rhodium-Catalyzed Phenylsilane Hydrosilation−Deoxygenation of Iron Acyl Complexes Cp(L)(CO)FeC(O)R (L = CO, PPh<sub>3</sub>, P(OMe)<sub>3</sub>, P(OPh)<sub>3</sub>; R = CH<sub>3</sub>, Ph, CHMe<sub>2</sub>, CMe<sub>3</sub>)
作者:Zhibiao Mao、Brian T. Gregg、Alan R. Cutler
DOI:10.1021/om970659m
日期:1998.5.1
The manganese carbonyl acyl complexes L(CO)4MnC(O)R (L = CO, R = CH3 (2a); L = CO, R = Ph (2b); L = PPh3, R = CH3 (2c)) are precatalysts for the PhSiH3 hydrosilation−deoxygenation of Cp(CO)2FeC(O)CH3 (1a) to Cp(CO)2FeCH2CH3 (6a). Thus, 2a (4%) and 1.1 equiv of PhSiH3 reduce 1a initially to a mixture of [Cp(CO)2FeCH(CH3)O]3-xHxSiPh (x = 2 (3b), 1 (4b), and 0 (5b)) (7−8 h), which transforms to a mixture
羰基锰锰配合物L(CO)4 MnC(O)R(L = CO,R = CH 3(2a); L = CO,R = Ph(2b); L = PPh 3,R = CH 3(2c))是用于Cp(CO)2 FeC(O)CH 3(1a)到Cp(CO)2 FeCH 2 CH 3(6a)的PhSiH 3硅氢化-脱氧的预催化剂。因此,2a(4%)和1.1当量的PhSiH 3最初将1a还原为[Cp(CO)2 FeCH(CH 3)O]的混合物3 - x H x SiPh(x = 2(3b),1(4b)和0(5b))(7-8 h),转换为5b(62%)和6a(35%)的混合物( 12小时)。同样,2b和PhSiH 3将1a转换为包含4%3b,22%4b,72%5b和2%6a(30分钟),然后达到15-20%6a(12 h)的混合物。使用2c作为预催化剂可以选择性地产生71%的4b和10%的6a(30分钟),然后高达1
Ironsilicon bond cleavage in dicarbonyl(ν5-cyclopentadienyl)(trimethylsilyl)iron using tetrabutylammonium fluoride
作者:David F. Marten、Susan M. Wilburn
DOI:10.1016/0022-328x(83)80245-9
日期:1983.7
Dicarbonyl(η5-cyclopentadienyl)(trimethylsilyl)iron (1) was found to react with a 1 M solution of tetrabutylammonium fluoride (2) in tetrahydrofuran at 25°C to give dicarbonyl(η5-cyclopentadienyl)iron anion (5). The anion generated under these conditions was trapped with electrophiles (RX) to give 45–89% yields of neutral dicarbonyl(η5-cyclopentadienyl)-alkyl, -allyl, -acyl-iron compounds and the