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X-ray crystallography of cholest-3,5-diene-7-one

机译:胆甾3,5-二烯-7-一的X射线晶体学

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The molecular structure of cholest-3,5-diene-7-one (C27H42O) is determined by X-ray diffraction. The compound crystallizes in the orthorhombic crystal system (space group P2(1)2(1)2(1)) with unit cell parameters a = 11.281(5) angstrom, b = 11.350(5) angstrom, c = 18.518(5) angstrom, and Z = 4. The structure is solved by direct methods and refined to an R-value of 0.054 for 1070 observed reflections [F-0 > 4 sigma(F-0)]. Ring A adopts a distorted half-chair conformation, ring B exists in sofa conformation, ring C acquires a chair conformation, and the five-membered ring D occurs in distorted half-chair conformation. The crystal structure is stabilized by van der Waals forces. (c) 2005 Pleiades Publishing, Inc.
机译:胆甾型3,5-二烯-7-一(C27H42O)的分子结构通过X射线衍射测定。该化合物在正交晶系系统空间空间P2(1)2(1)2(1)中结晶,晶胞参数a = 11.281(5)埃,b = 11.350(5)埃,c = 18.518(5) ,Z =4。该结构通过直接方法求解,对于1070个观察到的反射[F-0> 4 sigma(F-0)],其结构细化为R值为0.054。环A采用扭曲的半椅构型,环B以沙发构型存在,环C获得椅子的构型,五元环D则采用扭曲的半椅构型。晶体结构通过范德华力稳定。 (c)2005年Pleiades Publishing,Inc.

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