Hydrochloric acid and hydrobromic acid react with α-mono- and α, α-disubstituted β-lactones under ring cleavage leading unequivocally to the corresponding α-mono- or α, α-disubstituted β-halogenopropionic acids. These products are interesting starting materials for the preparation of new compounds and can be reduced by zinc and formic acid to the corresponding propionic acids. The described synthesis
盐酸和
氢溴酸在环裂解下与α-单-和α,α-二取代的β-内酯反应,明确导致相应的α-单-或α,α-二取代的β-卤代
丙酸。这些产品是制备新化合物的有趣原料,可以通过
锌和
甲酸还原为相应的
丙酸。所描述的合成是一般的合成并且可以高收率进行。此外,已经观察到,新的α,α-二取代的β-卤代
丙酸可以通过碱的作用或在中性或弱酸性介质中通过
锌的作用而被转化为
β-丙内酯。