Photochemistry of estra-5,7-diene-3β,17β-diol 17-acetate and its 9,10-seco isomer, 10-desmethyl analogues of pro- and previtamin D. 1. “Reversible” isomerization reactions
作者:R. B. Koolstra、J. Cornelisse、H. J. C. Jacobs
DOI:10.1002/recl.19871061003
日期:——
In analogy with the photochemistry of 7,8-didehydrocholesterol (provitamin D), irradiation of the 10-desmethyl steroid estra-5,7-diene-3β,17β-diol17-acetate leads to a photoequilibrated mixture of steroid-5,7-dienes and 9,10-seco-5(10),6,8-trienes. In addition, a thermally unstable bicyclo[2.2.0]hexene derivative is found. From the composition of the quasi-photostationary state, the ratios of the