C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 401/00 (2006.01) C07D 333/20 (2006.01) C07D 333/36 (2006.01) C07D 409/04 (2006.01) C07D 409/14 (2006.01) C07D 413/14 (2006.01)
Patent
CA 2041135
The invention relates to a method for the photochemi- cal isomerisation 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 isomerisation reaction.
Dufourny Alphons
Hoeve Wolter Ten
Koolstra Robert B.
Pauli Louis F.
Wynberg Hans
Duphar International Research B.v.
Fetherstonhaugh & Co.
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