P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
Description
5-Methylchroman-4-one is a useful reagent in cyclization and ring enlargement of (arylazo)(isocyanato)benzopyran derivatives to synthesize novel tricyclic O,N-heterocycles.