Method for producing fluorinated alkane, method for separating and recovering amidine base, and method for using recovered amidine base

摘要

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): the method comprising: a step (I) of adding an alkaline aqueous solution to a solution obtained by dissolving an amidine base-sulfonate complex in an aromatic hydrocarbon, to precipitate a sulfonic acid alkali metal sa a step (II) of adding water to the solution having the sulfonic acid alkali metal salt precipitated obtained in the step (I) to dissolve the sulfonic acid alkali metal salt, separating the aqueous layer having the sulfonic acid alkali metal salt dissolved and the layer of the aromatic hydrocarbon solution containing the amidine base from each other, and removing the aqueous layer having the sulfonic acid alkali metal salt dissolved; and a step (III) of distilling off the aromatic hydrocarbon from the aromatic hydrocarbon solution containing the amidine base obtained in the step (II); 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).