| abstract |
(57) [Abstract] [Problem] To perform chloromethylation of diphenyl, Minimize isomer by-products and minimize 4,4 ' -To obtain bis (chloromethyl) diphenyl in good yield. According to the method of the present invention, when chloromethylating diphenyl to obtain 4,4′-bis (chloromethyl) diphenyl, formaldehyde, hydrogen chloride and water are added to diphenyl and reacted in the presence of an organic acid. It is characterized by that. Here, in addition to the presence of an organic acid, a metal chloride selected from the group consisting of iron (III) chloride, zinc chloride, bismuth (III) chloride, copper (II) chloride, cobalt (II) chloride, and nickel (II) chloride. Chloromethylation is promoted by carrying out the chloromethylation reaction in the presence of a substance. Further, if the reaction product of the chloromethylation reaction is purified using alcohol, it can be easily purified and highly pure 4,4'-bis (chloromethyl) diphenyl can be obtained. |