Process for the preparation of piperonylidenecrotonic acid amides

摘要

Process for the preparation of piperonylidenecrotonic acid amides of the formula <IMAGE> in which R1 and R2 have the meaning given in the disclosure wherein piperonal is reacted with crotonic acid amides of the formula <IMAGE> in the presence of alkali metal hydroxides and dipolar aprotic diluents which are inert under the reaction conditions.