Some applications of nickel boride as a desulphurising agent. An improved route to triterpene 2-enes
作者:Robin B. Boar、David W. Hawkins、James F. McGhie、Derek H. R. Barton
DOI:10.1039/p19730000654
日期:——
defined for the desulphurisation of ethylene dithioacetals with nickel boride. Normally a mixture of saturated and unsaturated products is formed. Nickel boride is inferior to Raney nickel for the desulphurisation of thiophens. Hemithioacetals are rapidly cleaved by nickel boride, allowing regeneration of the ketone. Triterpene 2-enes are obtained in excellent yield from 3-ketones by desulphurisation
定义了将乙二
硫缩醛与
硼化镍进行脱
硫的最佳条件。通常形成饱和和不饱和产物的混合物。
硼化镍比阮内
镍劣于
噻吩脱
硫。半
硫缩醛可被
硼化镍快速裂解,从而使酮再生。通过用
硼化镍或阮内
镍对中间苄基
硫代(烯醇醚)进行脱
硫,可以从3-酮以优异的收率得到三萜2烯。