Configuration of Enolates of β-Ketocarboxylic Acid Esters — Carbocation-Carbanion Salts
作者:Herbert Meier、Monika Buß、Martin Adam
DOI:10.1002/jlac.199619961227
日期:1996.12
(E)-3-hydroxy-2,3-dimesitylpropenoic acid methyl ester (1a) with tetrakis(dimethylamino)-methane (3) led to stable salt (E)-2a, which belongs to a very rare species of salts that consist of a heteroatom-stabilized carbocation and a heteroatom-stabilized carbanion. An analogous guanidinium salt (E)-2b was formed in the reaction of 3-oxo-2,3-diphenylpropanoic acid methyl ester (1b) and 3. The molecular structures
(Z)-或(E)-3-羟基-2,3-二苯甲基丙酸甲酯(1a)与四(二甲氨基)-甲烷(3)脱质子化反应生成稳定的盐(E)-2a,属于a由杂原子稳定的碳正离子和杂原子稳定的碳负离子组成的非常稀有的盐类。在3-氧代-2,3-二苯基丙酸甲酯(1b)与3的反应中形成类似的胍盐(E)-2b。这些烯醇盐的分子结构通过NMR光谱和(E)-2a MC [N(CH3)2 ] 3 }并与相应的碱烯醇盐进行比较。