LETTER
Key A-ring Precursors of 1a, 25-Dihydroxyvitamin D3
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purchased from Aldrich (technical grade). Destilled before
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(13) Determined by GC on Chiralpak AD column.
(14) [a]D20 values (in CHCl3) for 6: -20.3 (c 1.50), 12: -36.0 (c
0.20), 13: +26.2 (c 0.32), 14: -52.4 (c 0.26), 15: -78.4 (c 3.85),
7c: -66.0 (c 1.02), 19: -22.0 (c 1.13), 20: -0.5 (c 2.10), 22: -
17.0 (c 1.00), 23: -0.6 (c 0.69) , 3d: +8.2 (c 1.34).
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Article Identifier:
1437-2096,E;1999,0,09,1435,1437,ftx,en;G15499ST.pdf
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Synlett 1999, No. 9, 1435–1437 ISSN 0936-5214 © Thieme Stuttgart · New York