Preparation method of alkyl carborane derivatives

The invention discloses a method for preparing alkyl carborane derivatives with potential high heating value. The method comprises the following three steps: 1. by using bis tetraethyl ammonium decahydrodecaborate as a raw material and ethyl sulfide as a reaction raw material and solvent, reacting at 0-5 DEG C by using concentrated sulfuric acid as a catalyst to obtain a dodecahydrodecaboro bis diethyl sulfide ether complex; 2. by using the dodecahydrodecaboro bis diethyl sulfide ether complex and halogenated alkyne in a mole ratio of 1:(1-5) as raw materials, stirring to react at 50-95 DEG C for 5-12 hours to obtain halogenated alkyl carborane; and 3. reacting the halogenated alkyl carborane and a halogenated alkyl carborane Grignard reagent in a mole ratio of 1:3-1:10 at 20-66 DEG C for 2-10 hours to obtain the alkyl-substituted carborane derivatives. The method is simple to operate, and has the characteristics of mild synthetic reaction conditions, wide application range, high selectivity and the like. The method is used for preparing the alkyl carborane derivatives.