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Photochemie in der Vitamin D‐Reihe. I. Kinetik und Quantenausbeuten der Ergosterinbestrahlung bei λ = 253,7 nm
Author(s) -
Pfoertner K.,
Weber J. P.
Publication year - 1972
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19720550319
Subject(s) - chemistry , isomerization , ring (chemistry) , ergosterol , medicinal chemistry , stereochemistry , photochemistry , organic chemistry , catalysis , biochemistry
Irradiation of Δ 5,7 ‐9α, 10β‐steroids in solution with λ = 253,7 nm yielded no Δ 5,7 ‐9β, 10α‐steroids and vice versa . No back reaction from precalciferol 2 to ergosterol could be detected by kinetic measurements. This leads to the conclusion that with the mercury resonance line only ring opening and 6,7‐ cis/trans isomerization but no ring closure occurs.