Photosensitizer

Details Photosensitizer Photosensitizer

1987-07-09

1990-06-26

Ivy, C. Warren

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

522 35, 522 68, 525102, 525156, 525161, 525279, 5253272, 5253305, 5253306, 5253593, 525379, 526284, 20415767, C08F 250, C08F 800, C07C17200, B01J 3106

Patent

active

049372920

ABSTRACT:
Photochemical conversion of tachysterols to previtamins is conducted in the presence of a polymeric photosensitizer which has the appropriate chromophore groups, e.g. anthracene groups, attached to a medium or high molecular weight, substantially uncrosslinked polymer backbone. The polymeric photosensitizer is soluble in solvents normally used for conducting the photochemical reaction (diethyl ether, dioxane, THF, t.butyl methyl ether) but insoluble in lower alcohols and hydrocarbons, so that it may be readily and simply recovered from the product mixture by use of such non-solvents.

REFERENCES:
patent: 3926641 (1975-12-01), Rosen
patent: 4052280 (1977-10-01), McGinnis
patent: 4089815 (1978-05-01), Reiter et al.

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