Dichloromethane → 1,1-Bis(4-hydroxyphenyl)-2,2-dichloroethylene

Participants

Reaction Steps

A solution prepared by dissolving 0.2 kg of 2.2-bis(3-methyl-4-hydroxyphenyl) propane in 1.2 kg of aqueous potassium hydroxide having a concentration of 16 mass % was mixed with 1.0 kg of methylene chloride. Then, while the solution was being stirred, phosgene gas was blown into the solution while cooling at 1 L/min until pH becomes 9 or less. Subsequently, the reaction solution was separated in a stand still manner, and a methylene chloride solution of an oligomer which has 2 to 6 polymerization degree and a chloroformate group at its molecular terminal was obtained as an organic layer (a solid content concentration of 0.30 kg/L). This oligomer is referred to as “PCO-C” hereinafter.

Provenance & Evidence