Formaldehyde → Benzoxazines

Participants

Reaction Steps

To a flask of 0.5 L in volume, 71.7 g (0.77 mol) of aniline and 150 mL of dioxane were placed and the mixture was stirred to dissolve. Then, 37.3 g of a formaldehyde solution (a 36 to 38% aqueous solution) was added dropwise to be reacted at room temperature for 2 hours. Thereafter, 71.5 g (0.38 mol) of 4,4′-dihydroxybiphenyl was added to be reacted with stirring at 100 to 110° C. for 6 hours. After completion of the reaction, a precipitate was filtrated and dried in a vacuum drier at 95° C. for 8 hours to obtain 148 g of the compound (E-1) having at least two benzoxazine rings and represented by the formula (15) below.

Provenance & Evidence