Ethyl Acetate → Propylene glycol methyl ether acetate

Participants

Reaction Conditions

Reaction Steps

30 g of poly(p-hydroxystyrene) (VP8000) produced by Nippon Soda Co., Ltd. was dissolved in 120 mL of dimethylsulfoxide (DMSO), and 9.36 g of (1-ethyl)cyclopentyl bromoacetate, 9.70 g of Compound (p-9) above, 34.51 g of potassium carbonate and 0.89 g of sodium iodide were added thereto. The mixture was stirred at 70° C. for 4 hours, and the reaction solution was returned to room temperature. Thereafter, 100 mL of ethyl acetate and 100 mL of distilled water were added thereto, and 130 g of an aqueous 23 mass % acetic acid solution was little by little added to the reaction solution while stirring the reaction solution in ice water. The reaction solution was transferred to a separating funnel, and 100 mL of ethyl acetate and 100 mL of distilled water were further added. After stirring, the aqueous layer was removed, and the organic layer was washed with 200 mL of distilled water five times. The organic layer was then concentrated to about 150 mL and added dropwise in 2 L of hexane. A part of the obtained precipitate was sampled for NMR measurement, and the remaining was dissolved in 70 g of PGMEA. From the obtained solution, the low boiling point solvent was removed by an evaporator to obtain 102.1 g of a PGMEA solution (34.6 mass %) of Resin (P-9).

Provenance & Evidence