confirmed the scheme suggested by Baker,3 and revealed that the reaction intermediates are enol esters which cyclize to γ-pyrones. Enol benzoate is probably the intermediate also in the Kuhn variant14 of the Allan-Robinson reaction. The Kostanecki-Robinson acylations in non-aqueous media correspond to the cyclization of enol esters2 in aqueous solvents. A kinetic study of the reaction has shown that the rate-determining
对Kostanecki-Robinson反应机理的重新检验已经证实了Baker,3提出的方案,并揭示了反应中间体是环化为
γ-吡喃酮的烯醇酯。烯醇
苯甲酸酯也可能是Allan-Robinson反应的Kuhn变体14中的中间体。非
水性介质中的Kostanecki-Robinson酰化反应对应于烯醇酯2在
水性溶剂中的环化。反应的动力学研究表明,决定速率的步骤是环化,发现其速率表达为: