Experimental Mechanistic Analysis of Carbonyl Hydrosilylation Catalyzed by Abu-Omar’s Rhenium(V) Oxo Complex
作者:Hua-Jie Jiang、Hendrik D. A. Simon、Elisabeth Irran、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1021/acs.organomet.2c00500
日期:2023.1.9
Based on new experimental data, a refined mechanistic picture of carbonyl hydrosilylation with hydrosilanes catalyzed by a cationic rhenium(V) oxo complex introduced by Abu-Omar is presented. A stereochemical analysis employing a silicon-stereogenic hydrosilane as a stereochemical probe revealed that both free silylcarboxonium ions and neutral rhenium(V) hydrides are key intermediates in the catalytic
Stereoselective Alcohol Silylation by Dehydrogenative Si-O Coupling: Scope, Limitations, and Mechanism of the Cu-H-Catalyzed Non-Enzymatic Kinetic Resolution with Silicon-Stereogenic Silanes
silanes-a process that was found to proceed without racemization at the siliconatom if asymmetrically substituted. The present investigation starts from this pivotal observation since silicon-stereogenic silanes are thereby suitable for the reagent-controlled kinetic resolution of racemic alcohols, in which asymmetry at the siliconatom enables discrimination of enantiomeric alcohols. In this full account
the use of (−)-menthol [(−)-7] allowed for a quantitative separation of silyl ethers (SiS)-10 and (SiR)-10 by practical fractional crystallization and (2) a diastereoselective copper-catalyzed dehydrogenative silicon-oxygen coupling using pyridyl alcohols (S)-16 or (R)-16 capable of two-point binding has been devised and assessed as a novel kinetic resolution strategy for the synthesis of a silane