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Tungsten complexes proton exchange

In mechanistic studies, the molybdacyclobutane of a MAP catalyst was found to break up to ethylene/methylidene intermediates 4500 times faster than the corresponding tungstacycle (at 40°C) [19]. Syn and anti proton exchange were also found to be significantly faster (up to lOOx s) for molybdacycles than for tungsta-cycles. Methylidene rotation about the M=C bond was determined to be comparatively slower for molybdenum complexes (<0.2 s ) than for tungsten complexes (3.6-230 s ). Schrock and coworkers proposed that many of these properties contribute to the superior efficiency of the tungsten MAP catalysts relative to their molybdenum counterparts. [Pg.257]


See other pages where Tungsten complexes proton exchange is mentioned: [Pg.111]    [Pg.87]    [Pg.113]    [Pg.144]    [Pg.287]    [Pg.299]    [Pg.430]    [Pg.341]    [Pg.3219]    [Pg.205]    [Pg.705]    [Pg.430]    [Pg.165]    [Pg.205]    [Pg.3218]    [Pg.212]    [Pg.268]    [Pg.5]    [Pg.92]   
See also in sourсe #XX -- [ Pg.87 ]




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