کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1307239 975129 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dioxo-molybdenum(VI) and -tungsten(VI) BINOL and alkoxide complexes: Synthesis and catalysis in sulfoxidation, olefin epoxidation and hydrosilylation of carbonyl groups
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Dioxo-molybdenum(VI) and -tungsten(VI) BINOL and alkoxide complexes: Synthesis and catalysis in sulfoxidation, olefin epoxidation and hydrosilylation of carbonyl groups
چکیده انگلیسی

The reaction of MoO2(mes)2 with S-H2BINOL (mes = 2,4,6-Me3C6H2; H2BINOL = 1,1′-bi-2-naphthol) and (CF3)2MeCOH in THF yielded the novel dioxo-molybdenum(VI) complexes MoO2(S-BINOL)(THF)2 and MoO2[OCMe(CF3)2]2(THF), respectively. Similar tungsten derivatives WO2(S-BINOL)(THF) and WO2[OCMe(CF3)2]2(THF) have been prepared by the reaction of WO2Cl2(DME) with the corresponding lithium salts of BINOL and 1,1,1,3,3,3-hexafluoro-2-methyl-2-propanol, respectively. Catalytic experiments have shown that MoO2(S-BINOL)(THF)2 is an active catalyst in the sulfoxidation of methyl phenyl sulfide and in the epoxidation of cis-cyclooctene with tert-butylhydroperoxide, under mild conditions. The BINOL complex was, however, not found to be enantioselective. In addition, the catalytic activity of the molybdenum species MoO2(S-BINOL)(THF)2 and MoO2[OCMe(CF3)2]2(THF) in the hydrosilylation of carbonyl groups has been explored.

The synthesis of the dioxo-molybdenum(VI) and -tungsten(VI) derivatives MO2(S-BINOL)(THF)n and MO2[OCMe(CF3)2]2(THF) (M = Mo, n = 2; W, n = 1) is reported. We have examined the potential of these complexes as catalysts for the sulfoxidation of methyl phenyl sulfide, olefin epoxidation and hydrosilylation of carbonyl groups.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 361, Issue 7, 20 May 2008, Pages 1915–1921
نویسندگان
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