title: Efficient photochemical formation of 1 alpha-hydroxyprevitamin D3.
abstract: Control of the band width of the irradiating light between 280 and 310 nm and of the temperature of the reaction permits formation of 1 alpha-hydroxyprevitamin D3 in yields of over 80%, at 40-60% conversion of the 1 alpha-hydroxyprovitamin D3. The procedures developed permit doubling the photochemical yield of the 1 alpha-hydroxyvitamin D3 compounds which are the major circulatory forms of vitamin D3.
mesh_terms: D006887:Hydroxycholecalciferols / Q000528:radiation effects*; D010777:Photochemistry; D013696:Temperature; D014466:Ultraviolet Rays
chemical_list: D006887:Hydroxycholecalciferols; C030850:1-hydroxyprevitamin D3