Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1991-04-24
1993-10-12
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
C07C40100, C07G 1300
Patent
active
052521915
ABSTRACT:
The invention relates to a method for the photochemical isomerization of organic compounds, in particular for the photochemical conversion of tachysterol compounds into previtamin D compounds and of trans-vitamin D compounds into cis-vitamin D compounds, under the influence of radiation, by exposing a solution of the organic compound to be converted in the presence of a non-polymeric photosensitizer to light with approx. 300-1,000 nm wavelength, and by then isolating the resulting product, wherein a substituted thiophene derivative having a substantial absorption in said wavelength region is used as the photosensitizer. The invention also relates to a new photosensitizer to be used for said isomerization reaction.
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Dufourny Alphons
Hoeve Wolter Ten
Koolstra Robert B.
Pauli Louis F.
Wynberg Hans
Delacroix-Muirheid C.
Duphar International Research B.V.
Niebling John
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