Reactions of zinc dialkyls with (perfluorophenyl)boron compounds: Alkylzinc cation formation vs C6F5 transfer
Reaction between ZnR2 and [H(OEt2)2] [B(C6F5)4] in ether leads to the salts [RZn(OEt2)3]-[B(C6F5)4], while mixtures of ZnR2 (R = Me, Et) and B(C6F5)3 in toluene-d8 undergo facile alkyl/C6F5 group exchange to give Zn(C6F5)2·(toluene). Mixtures of ZnR2 and B(C6F5)3 in hydrocarbon/diethyl ether solvent mixtures react with alkyl transfer to afford the ion pairs [RZn(OEt2)3][RB(C6 F5)3], whereas the reaction of ZnEt2 with [Ph3C][B(C6F5)4] in toluene-d8 proceeds with β-H abstraction to give ethene and Ph3CH, with the subsequent rapid formation of Zn(C6F5)2.
Walker, Dennis A.,Woodman, Timothy J.,Hughes, David L.,Bochmann, Manfred
p. 3772 - 3776
(2008/10/08)
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