Method of purifying phosphorus compound and method of reusing the same
[Problem to be Solved] An object of the present invention is to provide a method of purifying a phosphorus compound, which method is capable of reducing the generation of a by-product during distillation. [Solution to Problem] The method of method of purifying a phosphorus compound according to the present invention includes the steps of: obtaining a mixture containing a specific phosphorus compound, a specific alkenyl phosphorus compound and a transition metal complex; and subjecting the resulting mixture to distillation after adding a Lewis acid to the mixture, to obtain a first distillate containing the specific phosphorus compound.
1 . A method of purifying a phosphorus compound, comprising the steps of:
obtaining a mixture of a phosphorus compound represented by the following general formula (1):
wherein, in general formula (1), each of R 1 and R 2 independently represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aryloxy group; wherein R 1 and R 2 may be bonded with each other to form a cyclic structure, an alkenyl phosphorus compound represented by the following general formula (2):
wherein, in general formula (2), the definitions of R 1 and R 2 are the same as those of R 1 and R 2 in the general formula (1) and a transition metal complex; and
subjecting the mixture to distillation after adding a Lewis acid to the mixture, to obtain a first distillate containing the phosphorus compound represented by the general formula (1).
2 . The purification method according to claim 1 , wherein the content of a compound represented by the following general formula (3):
wherein, in general formula (3), the definitions of R 3 and R 4 are the same as those of R 1 and R 2 in the general formula (1); and R 5 represents a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted allyl group,
in the first distillate is 0.1% by mass or less with respect to the total mass of the first distillate.
3 . The purification method according to claim 1 , wherein the Lewis acid is a metal compound and/or a boron compound.
4 . The purification method according to claim 3 , wherein the metal compound is at least one selected from the group consisting of a zinc compound, an iron compound and an aluminum compound.
5 . The purification method according to claim 4 , wherein the zinc compound is zinc chloride.
6 . The purification method according to claim 1 , wherein each of R 1 and R 2 in the general formulae (1) and (2) independently represents a substituted or unsubstituted alkoxy group having from 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group.
7 . The purification method according to claim 1 , wherein, in the general formula (3), each of R 3 , R 4 and R 5 independently represents a substituted or unsubstituted alkoxy group having from 1 to 10 carbon atoms, a substituted or unsubstituted aryloxy group, or a substituted or unsubstituted allyl group.
8 . The purification method according to claim 1 , wherein the compound represented by the general formula (1) is dimethyl phosphite.
9 . The purification method according to claim 1 , wherein the compound represented by the general formula (2) is dimethyl vinylphosphonate.
10 . The purification method according to claim 2 , wherein the compound represented by the general formula (3) is trimethyl phosphite.