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.
适用于香精的γ-羟基
羧酸酯和γ-内酯可以通过在一个不分隔的电解池中,使用以
铅、
铅合
金、
镉、
镉合
金、
汞、钢、
玻璃碳或掺
硼金刚石组成的阴极以及包含可抑制阴极产氢的电解质盐的碱性
水性电解液中,将α,β-不饱和酯与羰基化合物进行电
化学还原交叉偶联来制备。