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.
On the mechanism of acidic hydrogen isotopic exchange in transition metal σ-benzyl-π-cyclopentadienyldicarbonyl complexes
作者:T.Yu. Orlova、V.N. Setkina、D.N. Kursanov
DOI:10.1016/s0020-1693(00)88329-2
日期:1981.1
Abstract The hydrogenisotopicexchange reaction in Fe, Mo and W σ-benzyl-π-cyclopentadienyl complexes has been discovered and studied. The reaction mechanism has been investigated by means of the stereochemical indication, kinetic effect etc. techniques.
Hydrosilylation of acyl-transition-metal complexes M-C(O)R (1) with H2SiPh2 in the presence of a catalytic amount of RhCl(PPh3)3 leads to the formation of the corresponding alpha-siloxyalkyl complexes M-CH(OSiHPh2)R (2). In case 1 contains a ligand or a substituent which stabilizes a transient cationic alkylidene intermediate M+ = CHR (5), overreduction takes place to afford M-CH2R (3) via 5. The mechanism of the overreduction has been studied by using alpha-methoxyalkyl complexes M-CH(OMe)R in place of 2. In addition, the chain propagation step in the Pichler-Schulz mechanism is mimiced by combination of the overreduction and carbonylation. Thus, the acetyl ligand in CpFe(CO)(PPh3)[C(O)CH3] (1f) is elongated to the pentanoyl ligand by repeating the homologation three times. Transformation of 1 to an alpha-alkoxyalkyl complex and an alpha-hydroxycarboxylic acid ester is also described.
CpFe(CO)2H: a reassessment of the literature
作者:Stuart B. Fergusson、Laura J. Sanderson、Thomas A. Shackleton、Michael C. Baird
DOI:10.1016/s0020-1693(00)82505-0
日期:1984.3
Li, Hong-ju; Turnbull, Mark M., Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 1993, vol. 23, p. 797 - 808