Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1984-06-14
1985-11-05
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
B01J 1912
Patent
active
045512140
ABSTRACT:
Compounds of the formula ##STR1## wherein R.sup.1 -R.sup.4 is hydrogen or chlorine, R.sup.5 is --COOMe or --SO.sub.3 Me, Me is an alkali metal cation and X is oxygen, sulfur or selenium, photosensitizers for the conversion of tachysterol into previtamin D are described. The tachysterol content in mixtures of previtamin D and tachysterol can be greatly reduced by visible light irradiation in the presence of such photosensitizers.
REFERENCES:
patent: 3575831 (1971-04-01), Pfoertner et al.
Hansen Hans-Jurgen
Pfoertner Karlheinz
Hoffmann-La Roche Inc.
Isgro William G.
Leon Bernard S.
Saxe Jon S.
Williams Howard S.
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