The invention relates to a process for preparing .alpha.-hydroxy-alkanoic acids of general formula: ##STR1## in which R represents hydrogen or a lower alkyl radical and Cy represents phenyl or a heterocyclic radical, both radicals optionally comprising one or more substituents selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl radicals and halogen atoms, process which comprises the treatment of an .alpha.,.alpha.-dihalogenated ketone of general formula: ##STR2## in which R and Cy have the same meaning as above and X represents chlorine, bromine or iodine, in the presence of an aqueous solution of an alkali metal hydroxide and a non polar organic solvent selected from an aromatic or alicyclic hydrocarbon, the treatment being carried out at a temperature between the boiling temperature of the reaction medium at atmospheric pressure and 240.degree. C. under pressure and the alkali metal so formed is then acidified to obtain the desired acid.
该发明涉及一种制备α-羟基-烷酸的方法,其一般公式如下:##STR1## 其中R代表氢或较低的烷基基团,Cy代表苯或杂环基团,这两个基团可以包含来自较低烷基、较低烯基、较低炔基基团和卤素原子等取代基,该方法包括在碱
金属氢氧化物的
水溶液和
芳香烃或脂
环烃中选择的非极性有机溶剂的存在下,处理一般式如下的α,α-二卤代酮:##STR2## 其中R和Cy的含义同上,X代表
氯、
溴或
碘,在大气压下反应介质的沸点温度和240°C之间的温度下进行处理,然后形成的碱
金属被酸化以获得所需的酸。