ISSN:
1572-8854
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract Crystal structure analysis has distinguished between the two epimers 17β-hydroxy-17α-methyl-5(β andα)-androstano-(2, 3-C)-1′, 2′, 5′-oxadiazole (HS804 and HS805). HS804 is trigonal,P32,a=14.820(4),c=7.177(3) Å,Z=3 and HS805 is orthorhombic,P212121,a=9.507(4),b=18.528,c=10.048(4) Å,Z=4. The crystal structures were solved by direct methods and refined by full-matrix least squares toR=0.0376 for 1419 reflections (HS804) andR=for 1819 reflections (HS805), using diffractometer measured data with CuKα radiation. The two molecules have different ring connections,A/B cis in HS804 andA/B trans in HS805, the planar oxadiazole ring beingcis fused to ringA in both molecules. RingA is strained in both molecules.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01168550
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