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Grubbs-Hoveyda-type precatalysts

Grubbs-Hoveyda-Type Precatalysts 281 Table 9.5 Solvent effects with the first-generation Grubbs compiex 1 [13]. [Pg.281]

Much effort has been expended recendy to understand how Hoveyda-type precatalysts initiate. Originally, it was simply assumed that the initiation mechanism was dissociative and data to support this was pubHshed by Love et al., in which no dependence of the initiation rate of GH2 on substrate concentration was observed. No entropy change was required to reach the transition state (AH = 19.9(5) kcal moH and AS = 1(2) cal mol for the initiation of GH2 with EVE in toluene). However, activation parameters collected during a later study, also by the Grubbs group, suggested a nondissociative mechanism, due to the negative entropy of activation (AH = 15.2(8) kcal mol and AS = —19(3) cal moH for the... [Pg.99]

See other pages where Grubbs-Hoveyda-type precatalysts is mentioned: [Pg.281]    [Pg.283]    [Pg.285]    [Pg.287]    [Pg.281]    [Pg.283]    [Pg.285]    [Pg.287]    [Pg.288]    [Pg.163]    [Pg.84]    [Pg.137]    [Pg.316]   
See also in sourсe #XX -- [ Pg.281 , Pg.283 , Pg.284 , Pg.286 , Pg.288 , Pg.384 ]



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Grubb

Grubbs

Grubbs-type

Hoveyda

Hoveyda-Grubbs

Precatalyst

Precatalysts

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