1-prop-2-enylpyrrole-2,5-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 25 g of a commercial styrene/maleic anhydride copolymer (1/1 molar ratio, Mn 1600) and 250 mL of glacial acetic acid was stirred under nitrogen while 7.1 g of allylamine was added dropwise over a period of 10 min. The mixture was then heated at 114° for 2 hours. The clear solution was cooled, treated with 0.125 g of 2,6-di-tert-butyl-4-methylphenol, and added with stirring to about 2500 mL of water. The precipitated polymer was filtered, washed, re-dissolved in about 700 mL of acetone and again precipitated in excess water acidified with 10 mL of concentrated hydrochloric acid/liter. The resultant polymer was dried to constant weight under vacuum. The N-allylmaleimide copolymer was obtained as a white powder; weight 25.4 g. The infrared spectrum showed imide absorption at 1705 cm-1 and 1775 cm-1, and essentially no anhydride or amide absorption was seen. The nmr spectrum was also consistent with the styrene/N-allylmaleimide structure. The nitrogen analysis and nmr spectrum indicated about 75% conversion of anhydride groups to N-allylmaleimide groups, and complete hydrolysis was indicated for the remainder of the anhydride units. Found, N 4.38%. was added dropwise over a period of 10 min The mixture was then heated at 114° for 2 hours The clear solution was cooled added The precipitated polymer was filtered washed re-dissolved in about 700 mL of acetone again precipitated in excess water The resultant polymer was dried to constant weight under vacuum