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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 160, Issue 1, Pages 181-187Publisher
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DOI: 10.1016/S1381-1169(00)00245-4
Keywords
inorganic oxides; olefin metathesis; alkylidenemolybdenum(VI) complexes
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This work describes the reactivity of Schrock-type alkylidenemolybdenum(VI) complexes, Mo(=CHCPhMe2)(= NAr)((OBu)-Bu-I)(2), I, or Mo(= CHCPhMe2)(= NAr)[OCMe(CF3)(2)](2), II, with the surface of silica, silica-alumina and niobia. In situ FT-IR studies suggest that I and II are attached to the surface of silica via a Lewis acid base adduct; on silica-alumina, an OH addition to the Mo=N bond seems to take place. Grafting of I and II causes a decrease in their intrinsic catalytic activity as well as a change in the stereoselectivity of II in ROMP of norbornene. (C) 2000 Elsevier Science B.V. All rights reserved.
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