1α-Hydroxyprovitamin D is found to undergo a new photochemical isomerization cascade initiated by the 1,10-bond cleavage in addition to the normal electrocyclic B-ring opening and this new isomerization becomes the major pathway when a methyl group is present in the 1β-position.
S. Yamada, H. Ishizaka, H. Ishida and K. Yamamoto, J. Chem. Soc., Chem. Commun., 1995, 423 DOI: 10.1039/C39950000423
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