Synthesis and x-ray structure of a simple metallaoxetane. Metal-based selectivity in oxidative addition
作者:Andrei A. Zlota、Felix Frolow、David Milstein
DOI:10.1021/ja00173a047
日期:1990.8
La reaction d'3-halogeno-2-methyl propan-2-ol avec le complexe RhL 3 Cl (L=PPh 3 ) donne le complexe (PPh 3 ) 3 (Br)(Cl) (2-hydroxy-2-methylpropyl) du rhodium qui reagit ensuite avec (Me 3 Si) 2 NK pour donner le complexe (PPh 3 ) 3 (Br) (3,3-dimethyl) 1-Oxa-2-rhodacyclobutane. Etude par diffraction de ces deux complexes
La 反应 d'3-halogeno-2-methyl propan-2-ol avec le complexe RhL 3 Cl (L=PPh 3 ) donne le complexe (PPh 3 ) 3 (Br)(Cl) (2-羟基-2-甲基丙基) ) du rhodium qui reagit ensuite avec (Me 3 Si) 2 NK Pour donner le complexe (PPh 3 ) 3 (Br) (3,3-二甲基) 1-Oxa-2-rhodacyclobutane。练习曲 par 衍射 de ces deux complexes
Oxidative addition of Si–Cl bonds to electron-rich Ir<sup>I</sup>complexes
作者:Andrei A. Zlota、Felix Frolow、David Milstein
DOI:10.1039/c39890001826
日期:——
Si–Clbonds undergo facile, rarely observed oxidativeaddition to (C8H14)Ir(PMe3)3Cl (1) to yield, when MeSiCl3 is used, the crystallographically characterized mer-Ir(PMe3)3(Cl)2(SiMeCl2), exhibiting a short Ir–Si bond; reaction of (1) and of other electron-rich IrI complexes with Me3SiCl yields Ir–H complexes, probably arising from a rare silyl β-hydride elimination process.
Oxidative Addition of Water and Aliphatic Alcohols by IrCl(trialkylphosphine)<sub>3</sub>
作者:Ofer Blum、David Milstein
DOI:10.1021/ja012611c
日期:2002.9.1
Oxidative addition of aliphatic alcohols to (C8H14)IrCl(PMe3)(3) in benzene yields the cis-hydridoalkoxo products mer-cis-HIr(OR)Cl(PMe3)(3) (R = Me, Et, 1-pentyl, 2-propyl) The analogous hydroxo complex is prepared by oxidative addition of water in THF. The addition rate depends on the nature of the alcohol (methanol > 1-pentanol >> 2-propanol and methanol > water). The reaction is retarded in polar media but accelerated by protic cosolvents. Anionic ligand redistribution involving chloride and alkoxide (or hydroxide) competes with the oxidative addition reaction. A detailed kinetic study suggests that the 16-electron 10(PMe3)(3) is the species undergoing the oxidative addition, and mer-cis-HIr(OR)Cl(PMe3)(3) is the kinetic product. The reaction proceeds by a single-step nucleophilic attack of the metal on the O-H proton pi-Donation by chloride stabilizes the transition state and governs the stereochemical course of the reaction Protic solvent aggregation in the transition state in an apolar medium is suggested mer-cis-HIr(OH)Cl(PEt3)(3), obtained by water addition to IrCl(PEt3)(3), was crystallographically characterized, showing an unusual hydrophobic cage around the hydride ligand.