Nucleophilic vinyl substitution: IV. Effect of lithium cation on reactions of β-halo-α,β-difluorostyrenes with dicarbonyl(cyclopentadienyl)iron and 9-methylfluorenide anionsстатья
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Аннотация:Study of the effects of solvent (THF and ether), HMPA, [2.1.1]cryptand, LiCl, and LiBPh4 on reactions of CpFe(CO)2Li and lithium 9-methylfluorenide with α,β,β-trifluorostyrene and (Z)-β-chloro-α,β-difluorostyrene has shown that the reaction rate increases with increasing fraction of solvent-separated ion pairs and free ions. Formation of ion pairs with large complex cations, e.g., lithium [2.1.1]cryptate, can considerably reduce the reactivity of nucleophile.