9,10‐Secocholesta‐(5Z)‐5,8(14),10(19)‐triene‐3β‐ol and 18‐Nor‐14β‐methyl‐9,10‐secocholesta‐(5E)‐5,10(19), 13(17)‐trien‐3β‐ol, two new double bond isomers of vitamin D3. Structural modifications of vitamin D3: 5. Communication [1]
The present paper reports the synthesis and structure elucidation of the two title compounds. Treatment of the 4‐phenyl‐1,2,4‐triazolin‐3,5‐dione adducts of vitamin D3 with BF3O (C2H5)2 and KOH/butanol yields these two new vitamin D3 double bond isomers.