Demonstration of promoted zinc Schlenk equilibria, their equilibrium values and derived reactivity

AJ Blake, J Shannon, JC Stephens…

文献索引：Blake, Alexander J.; Shannon, Jonathan; Stephens, John C.; Woodward, Simon Chemistry - A European Journal, 2007 , vol. 13, # 9 p. 2462 - 2472

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被引用次数: 28

摘要

Abstract The presence of promoted Schlenk equilibria for organozinc halide species has been explicitly demonstrated by 13 C NMR studies. Thus, addition of methylaluminoxane (MeAlO) n, MAO, to RZnX (R= Et, Bn, ArCH 2,(CH 2) 3 CO 2 Et; X= Cl, Br) leads to the formation of ZnR 2 and ZnX 2⋅ MAO. For EtZnCl, equilibration of ZnEt 2 and ZnX 2⋅ MAO is rapid at− 35 C; a K value of 0.19 M− 1 indicates the equilibrium favours ZnEt 2 (0.75–3.0 ...