Photolysis of ergosterol in the presence of pentacarbonyliron gave (tachysterol2)tricarbonyliron and (precalciferol2)-tricarbonyliron as major and minor products respectively. Oxidation of these complexes with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone gave (5E,7Z,22E)-9,10-secoergosta-1(10),5,7,9(11),22-pentaen-3β-ol.
A. G. M. Barrett, D. H. R. Barton and G. Johnson, J. Chem. Soc., Perkin Trans. 1, 1978, 1014 DOI: 10.1039/P19780001014
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