Sensitized photochemical preparation of vitamin D

Details Sensitized photochemical preparation of vitamin D Sensitized photochemical preparation of vitamin D

1985-11-26

1987-08-11

Demers, Arthur P.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

2603972, C07C 172, C07J 900

Patent

active

046860231

ABSTRACT:
Tachysterol-2 or tachysterol-3 is photochemically converted in high yield to previtamin D.sub.2 or previtamin D.sub.3 respectively, by irradiation in the presence of anthracene as photosensitizer. The wavelength of irradiation is suitably about 375 nm. This irradiation may be performed upon the mixture of substances resulting from the prior photolysis of a starting material selected from ergosterol (for previtamin D.sub.2) and 7-dehydrocholesterol (for previtamin D.sub.3) with 240-265 nm wavelength light, i.e. a mixture containing the respective lumisterol, starting material and previtamin, as well as the respective tachysterol. Using the process of the invention, conversions of tachysterol to previtamin as high as 93% can be achieved, and overall conversions of ergosterol or 2-dehydrocholesterol to previtamin D.sub.2 or previtamin D.sub.3 respectively can be as high as 80%.

REFERENCES:
patent: 4265822 (1981-05-01), DeLuca et al.

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