CRYSTAL-STRUCTURES OF 2 MODIFICATIONS OF TRANS-1,3-BIS(3,4-DIMETHOXYPHENYL)-2,3-EPOXY-1-PROPANONE

被引：5

作者：

STOMBERG, R

LI, SM

LUNDQUIST, K

机构：

[1] UNIV GOTHENBURG,S-41296 GOTHENBURG,SWEDEN

[2] CHALMERS UNIV TECHNOL,DEPT ORGAN CHEM,S-41296 GOTHENBURG,SWEDEN

来源：

JOURNAL OF CHEMICAL CRYSTALLOGRAPHY | 1994年 / 24卷 / 07期

关键词：

C19H20O6; CHALCONE; DIMORPHISM; EPOXIDE;

D O I：

10.1007/BF01666086

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

trans-1,3-Bis(3,4-dimethoxyphenyl)-2,3-epoxy-1-propanone exhibits dimorphism and crystallizes in a monoclinic form from ethanol and in a trigonal form from chloroform/hexane. The crystal structures of the two modifications were determined by single-crystal X-ray diffraction methods. The monoclinic form crystallizes in space group P2(1)/c with a = 8.709(2), b = 7.986(1), c = 25.223(4) Angstrom, beta = 94.83(2)degrees, V = 1747.9(6) Angstrom(3) and Z = 4. R = 0.052 for 1236 reflections [I > 3 sigma(I)]. The trigonal form crystallizes in space group R $($) over bar$$ 3 with a = 36.048(6), c = 8.313(5) Angstrom, V = 9355(6) Angstrom(3) and Z = 18 (hexagonal axes). R = 0.101 for 1216 reflections [I > 3 sigma(I)]. In the trigonal crystals there are channels in the c-direction with a diameter of approximately 10 Angstrom. Possible explanations for the comparatively high R-value are discussed.

引用

页码：407 / 413

页数：7

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