Lactones of the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group and n represents an integer of 0 to 10, are produced by reacting a diol, formaldehyde and carbon monoxide in the presence of copper (I) or silver carbonyl complex catalyst in a strong acid.
以下通式的内酯:##STR1## 其中,R1和R2分别代表氢原子或烷基,n表示0至10的整数,通过在强酸存在下,将二元醇、
甲醛和
一氧化碳在
铜(I)或
银羰基络合催化剂的存在下反应而制得。