A process for producing vitamin A represented by the formula ##STR1## which comprises treating a compound represented by the formula ##STR2## wherein R.sup.1 represents an aryl group which may be substituted, R.sup.21 and R.sup.22 each represents a hydrogen atom or a lower alkanoyl group, R.sup.3 represents an acetal-type protective group for a hydroxyl group, and X represents a halogen atom, with a base; and novel intermediate compounds useful for the above process.
一种制备
维生素A的方法,其
化学式为##STR1##,包括用碱处理
化学式为##STR2##的化合物,其中R.sup.1代表可能被取代的芳基,R.sup.21和R.sup.22分别代表氢原子或较低的烷酰基,R.sup.3代表羟基的
缩醛型保护基,X代表卤素原子;以及用于上述方法的新型中间体化合物。