Dimethylmaleic anhydride → N-(4-hydroxycyclohexyl)-dimethylmaleimide

Participants

Reaction Conditions

Reaction Steps

126 g (1 mol) of dimethylmaleic anhydride and 115 g (1 mol) of 4-aminocyclohexanol are warmed, in an oil bath whilst stirring, to 120° to 125° C. (internal temperature) for 30 minutes. After cooling to 20° C., the reaction product is dissolved in 500 ml of methylene chloride and extracted once with 100 ml of 1 N NaOH, whilst cooling with ice. The reaction product is then washed twice with water and dried over sodium sulphate. The solvent is evaporated and the residue is recrystallised from a 1:1 mixture by volume of ethyl acetate and petroleum ether. 155 g (70% of theory) of N-(4-hydroxycyclohexyl)-dimethylmaleimide are obtained; melting point 109° to 111° C.

Provenance & Evidence