4,4-Diaminodiphenylmethane → 1,1'-(Methylenedi-p-phenylene)bismaleimide

Participants

Reaction Conditions

Reaction Steps

Di(para-aminophenyl)methane 198.2 g (1.0 moles) is dissolved in 500 ml of acetone and mixed with 196.2 g (2.0 moles) of maleic anhydride in a 2000 ml Erlenmeyer flask. The flask is stirred for 2 hours at 20° C. Then 15.0 g of sodium acetate and 250 g of acetic anhydride are added and the mixture is heated to 60° C. for 2-3 hours to form the desired bismaleimide product. The product is precipitated from water, washed and recovered by filtration and then dried. The yield is about 95%. The material gives an NMR spectra characterized by olefinic protons at 7.1 ppm, aromatic protons at 6.9-7.6 ppm, and methylene protons at 4 ppm.

Provenance & Evidence