Acetone → Propylene glycol methyl ether acetate

Participants

Reaction Steps

Into a four-necked flask equipped with a condenser, a stirrer and a thermometer, 174.5 parts of the resin obtained and 1,047 parts of acetone were charged to obtain a solution. To the solution, 19.7 parts of triethylamine was added and the resultant mixture was heated to 40° C. To the mixture, 18.3 parts of benzoyl chloride was added dropwise over 30 minutes and the resultant mixture was kept at 40° C. for 3 hours. The obtained mixture was mixed with 698 parts of ethyl acetate and 640 parts of 0.5% aqueous solution of oxalic acid. the resultant mixture was separate to obtain the organic layer and the aqueous layer. The organic later obtained washed with an aqueous solution of oxalic acid. The obtained organic layer was mixed with 698 parts of ethyl acetate, 698 parts of propylene glycol methyl ether acetate and 436 parts of water. The resultant mixture was stirred and separated to obtain the organic layer. The organic layer was washed four times with water and concentrated under reduced pressure. The residue was mixed with propylene glycol methyl ether acetate to concentrate under reduced pressure to obtain 543 parts of a propylene glycol methyl ether acetate solution containing the resin (the content of the solid: 33.7%). The resin obtained is called as A1.

Provenance & Evidence