Photolysis of 7-dehydrocholesterol

摘要

Quasi-monochromatic light from an excimer or exciplex emitter can be used to catalyze production of provitamin D3 from 7-dehydrocholesterol, resulting in a purer product than with mercury lamps, which emit a wider band of wavelengths. A photochemical method for preparation of provitamin D3 comprises treatment of 7-dehydrocholesterol (7-DHC) in a reactor with a source of ultraviolet radiation. The source is an excimer or exciplex emitter, which emits quasi-monochromatic UV light by the silent discharge method.