Reactions of Zinc Dialkyls with (Perfluorophenyl)boron Compounds: Alkylzinc Cation Formation vs C6F5 Transfer
摘要:
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-d(8) 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(C6F5)(3)], whereas the reaction of ZnEt2 with [Ph3C] [B(C6F5)(4)] in toluene-d(8) proceeds with beta -H abstraction to give ethene and Ph3CH, with the subsequent rapid formation of Zn(C6F5)(2).