γ-Hydroxycarboxylic esters and γ-lactones which are suitable as flavors can be prepared by electrochemical reductive cross-coupling of α,β-unsaturated esters with carbonyl compounds in an undivided electrolysis cell having a cathode composed of lead, lead alloys, cadmium, cadmium alloys, mercury, steel, glassy carbon or boron-doped diamonds and a basic aqueous electrolyte comprising an electrolyte salt which suppresses the cathodic formation of hydrogen.
适用作为香精的γ-羟基
羧酸酯和γ-内酯可通过在一个无隔板电解池中,采用
铅、
铅合
金、
镉、
镉合
金、
汞、钢、
玻璃碳或掺
硼金刚石组成的阴极,并且包含一种抑制阴极生成氢的电解质盐的碱性
水性电解液中,通过α,β-不饱和酯与羰基化合物的电
化学还原交叉偶联制备。