Preparation of cis-2-olefine acids

A process for the preparation of a cis-2-olefine acid or an alkali metal salt thereof, comprising rearranging 1, 3-dibromo-2-alkanone in an alkaline environment in the presence of a catalytically effective amount of a cis-2-olefine acid alkali metal salt, and separating the cis-2-olefine acid in the form of a free acid or in the form of an alkali metal salt from the reaction mixture. 一种制备顺式-2-链烯酸或其碱金属盐的方法，包括在催化有效量的顺式-2-链烯酸碱金属盐存在下，在碱性环境中重排1,3-二溴-2-烷酮，并从反应混合物中分离游离酸形式的或碱金属盐形式的顺式-2-链烯酸。