Synthesis and biological activities of 2α-chloro-1-epicalcitriol and 1-epicalcitriol 11Dedicated to Prof. Dr. P. Welzel on the occasion of his 60th birthday.

Bioactive Compounds with Added Value Prepared from Terpenes Contained in Solid Wastes from the Olive Oil Industry

“…With an extra time of 20 min, the exocyclic triene 9 appeared, which has two conjugated C¼C bonds between C(8) and C (26) and between C(9) and C(11), and additionally an isolated C¼C bond between C(13) and C (14). These processes were based on previously known photochemical interconversions of provitamin D2, lumisterol, previtamin D2, tachysterol, and some derivatives, in addition to photochemical and thermal transformations of some pentacyclic triterpenoids, such as methyl dehydroursolate [22].…”

“…was concentrated under reduced pressure. The solid residue was purified with SiO 2 CC to afford 43 (31 mg, 78%) [22].…”