کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1311592 975334 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cationic oxorhenium chiral salen complexes for asymmetric hydrosilylation and kinetic resolution of alcohols
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Cationic oxorhenium chiral salen complexes for asymmetric hydrosilylation and kinetic resolution of alcohols
چکیده انگلیسی

High valent transition metal oxo complexes are ubiquitous in catalytic oxidation and oxygen atom transfer reactions, while their application in catalytic reductions is only being realized in the past few years. Reaction of ReOCl3(PPh3)2 with appropriate chiral salen ligands, followed by oxo abstraction with a silylium cation, afforded several cationic oxorhenium(V)-saldach complexes 1–2, including a rare trinuclear rhenium cluster (2), all of which have been fully characterized. These complexes are effective catalysts for hydrosilylation of carbonyl compounds and silane alcoholysis, although the enantioselectivity for both reactions is rather low. An intermediate, featuring a partially reduced saldach ligand (a salen/salan hybrid), was identified in reaction of 1a with Et3SiH. The reaction mechanism is discussed in light of results from a crossover experiment.

A series of cationic oxorhenium (V) chiral salen complexes, including a rare trinuclear rhenium species, have been prepared and fully characterized. These compounds are found to be effective for catalytic hydrosilylation of ketones and silane alcoholysis. The reaction mechanism is discussed in light of an isolated intermediate and a crossover experiment.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 361, Issue 11, 27 July 2008, Pages 3184–3192
نویسندگان
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