| 摘要 |
Allylic halides containing not more than eight carbon atoms are hydrolysed to primary allylic alcohols by an alkaline medium in the presence of an additive comprising copper or a copper compound. Some secondary allylic alcohols are also formed. The additive is preferably used in the form of finely divided solid in an amount of 0.01-5% by weight of the allylic halide, copper metal being preferred. The hydrolysis is preferably carried out in the liquid phase at temperatures of 50-200 DEG C. and at atmospheric pressure. Preferred hydrolysing agents are 1-10% by weight aqueous solutions of alkali metal hydroxides, particularly sodium hydroxide. A small amount, for example 5% by weight of the reaction mixture of a surface-active agent may be added. Preferred allylic halides are branched chain chlorides obtained by monochlorinating dimers, including codimers, of propylene and butylene, especially isobutene dimer. Octanols may be obtained by reduction of the primary C8 alcohols obtained by the process of the invention from monochlorinated isobutene dimer. Examples describe the hydrolysis of the individual or mixed allylic chloride obtained by chlorinating di-isobutene. Some secondary alcohols are obtained as by-product. Comparative examples are given in which no copper additive is present. |
