Aggregation and Alkylation of Enolates of 2-Phenyl-α-tetralone and 2,6-Diphenyl-α-tetralone<sup>1</sup>
作者:Daniel Zerong Wang、Yeong-Joon Kim、Andrew Streitwieser
DOI:10.1021/ja0010002
日期:2000.11.1
lithium (1-Li, LiPhPAT) enolates of 2,6-diphenyl-α-tetralone, 1, and the lithium enolate (2-Li, LiPhAT) of 2-phenyl-α-tetralone, 2, are present in dilute THF solution as monomers and dimers with K1,2 = 1810 (1-Cs, CsPhPAT), 2650 (1-Li, LiPhPAT), and 1930 (2-Li, LiPhAT) M-1. These values were obtained by singular value decomposition analysis of the UV spectra and by the dependence of ion pair pK's with concentration
铯 (1-Cs, CsPhPAT) 和锂 (1-Li, LiPhPAT) 2,6-二苯基-α-四氢萘酮, 1 的烯醇化物和 2-苯基-α-的锂烯醇化物 (2-Li, LiPhAT)四氢萘酮,2,作为单体和二聚体存在于稀释的 THF 溶液中,K1,2 = 1810 (1-Cs, CsPhPAT)、2650 (1-Li, LiPhPAT) 和 1930 (2-Li, LiPhAT) M-1。这些值是通过紫外光谱的奇异值分解分析和离子对 pK 与浓度的相关性获得的。在先前定义的离子对 pK 标度上,单体的 pK = 17.80(1-Cs,CsPhPAT)和 11.14(1-Li,LiPhPAT)。在烷基化反应中,单体比二聚体快得多;烷基卤化物的反应产物是 C-烷基化的产物,但 1-Cs (CsPhPAT) 与甲基磺酸盐会产生大量的 O-烷基化。