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1  used to construct the dienyne precursors of previtamin 6 possessing two methyl groups capable of par
2 nalyzed in depth, i.e., the conformations of previtamin D and the quantum effects associated with the
3 e characterization of the conformers of both previtamin D and vitamin D allowed the calculation of th
4 analogue 12 was prone to conversion into its previtamin D form by thermal equilibration, the correspo
5 /[1,5]-hydrogen shift sequence that emulates previtamin D photobiology.
6 or-1alpha,25-(OH)2D3, were obtained from the previtamin D precursors, constructed by either Suzuki-Mi
7  in isomerization of 7-dehydrocholesterol to previtamin D that spontaneously isomerizes to vitamin D.
8         Of the large number of conformers of previtamin D that were located, there are 16 that have t
9 he thermal isomerization reaction converting previtamin D to vitamin D is an intramolecular [1,7]-sig
10 to-isomers lumisterol(2), tachysterol(2) and previtamin D(2) increased in this order.
11 ) was the most abundant product, followed by previtamin D(2), lumisterol(2) and tachysterol(2) in ord
12  study, the ergosterol-derived photoproducts previtamin D(2), lumisterol(2) and tachysterol(2) were,
13 droxylate tachysterol(3) , a photoproduct of previtamin D(3) , producing 20S-hydroxytachysterol(3) [2
14 f exposure to solar UVR based on the ex vivo previtamin D(3) action spectrum require revision.
15                  It was established that the previtamin D(3) action spectrum was not valid when relat
16 tly between groups nor did its conversion to previtamin D(3) after irradiation in vitro.
17 e photoconversion of 7-dehydrocholesterol to previtamin D(3) An action spectrum for this process that
18 osynthesis of vitamin D and tachysterol from previtamin D, leveraging positional or geometric isomeri
19 ntroduced by the flexibility of the rings of previtamin D.
20      We reported previously that the rate of previtamin D3 (preD3) <==> vitamin D3 isomerization was
21 at the conversion of 7-dehydrocholesterol to previtamin D3 was reduced in children a mean of 14 month
22 n the skin, leading to its transformation to previtamin D3, which is rapidly converted to vitamin D3.
23 sterification of the 3beta-hydroxy of preD3 (previtamin D3-3beta-acetate) reduced the rate of the iso
24  nm to determine their efficiency to produce previtamin D3.