The present invention provides: a method for producing a fluorinated alkane represented by the formula (2): R
2
—F, wherein an alcohol having 3 to 5 carbon atoms is fluorinated by a fluorinating agent represented by the formula (1): R
1
SO
2
F in the absence of a solvent, and in the presence of a base selected from the group consisting of an amidine base and a phosphazene base; a method for separating and recovering an amidine base from an amidine base-sulfonate complex represented by the following formula (5); and a method for using a recovered amidine base. In the formula, R
1
represents a methyl group, an ethyl group or an aromatic group, R
2
represents an alkyl group having 3 to 5 carbon atoms, and n is 0 or 2.
本发明提供:一种生产由公式(2)表示的
全氟烷R2—F的方法,其中,在没有溶剂的情况下,通过由公式(1)表示的
氟化剂R1SO2F对具有3至5个碳原子的醇进行
氟化,并且存在从酰胺碱和
磷氮烯碱组成的组中选择的一种碱;一种从由以下公式(5)表示的酰胺碱
磺酸盐络合物中分离和回收酰胺碱的方法;以及一种使用回收的酰胺碱的方法。在公式中,R1代表甲基、乙基或芳香基团,R2代表具有3至5个碳原子的烷基,n为0或2。