Patent ID: 8410298

Claim:
A method for producing a phosphoric acid ester, comprising: a step (1): a step of allowing phosphorus oxytrihalide represented by Formula (I) [Chemical Formula 18] (wherein X is halogen) to react with a phenol compound or naphthol compound represented by Formula (II) [Chemical Formula 19] (wherein R 1 , R 2 , R 3 , R 4 and R 5 are independent from one another, and are a hydrogen atom, a straight or branched-chain C 1-6 alkyl group, or a C 6-12 aryl group which may be substituted with a straight or branched-chain C 1-4 alkyl group, and alternatively R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , or R 4 and R 5 may form a 6-membered ring together with the carbon atoms of the benzene ring to which these groups are bound, provided that R 1 , R 2 , R 3 , R 4 and R 5 are not hydrogen atoms at the same time), at a molar ratio of 1.1-3.0:1 in the presence of a metal halide, to produce a mono-substituted phosphorodihalidate represented by Formula (III) [Chemical Formula 20A] (wherein X, R 1 , R 2 , R 3 , R 4 and R 5 have the same meaning as the above-described meaning); and a step (2): a step of allowing the mono-substituted phosphorodihalidate obtained in the step (1) represented by the Formula (III) [Chemical Formula 20B] to react with a diol compound represented by Formula (IV) [Chemical Formula 21] (wherein R 6 and R 7 are independent from each other, and are a hydrogen atom, a straight or branched-chain C 1-6 alkyl group, or a C 6-12 aryl group which may be substituted with a straight or branched-chain C 1-4 alkyl group) so as to perform a dehydrohalogenation reaction to produce a phosphorus compound represented by Formula (V) [Chemical Formula 22] (wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 have the same meaning as the above-described meaning).