首页> 外文期刊>Journal of chemical crystallography >Investigation of an inclusion compound or trans-1, 3-bis(3, 4-dimethoxyphenyl)-2, 3-epoxy-1-propanone with chloroform by NMR spectroscopy and X-ray crystallography
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Investigation of an inclusion compound or trans-1, 3-bis(3, 4-dimethoxyphenyl)-2, 3-epoxy-1-propanone with chloroform by NMR spectroscopy and X-ray crystallography

机译:NMR和X射线晶体学研究氯仿中夹杂物或反式1,3-双(3,4-二甲氧基苯基)-2,3-环氧-1-丙酮

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摘要

trans-1, 3-Bis(3, 4-dimethoxyphenyl)_2,3-epoxy-1-propanone crystallizes in a monoclinic form (m.p. 155-156 deg C, from ethanol) and a trigonal form (m.p. 125-126 deg C, from chloroform/hexane or chloroform). NMR studies revealed that chloroform is present in the crystals of the trigonal form (epoxide/chloroform ratio approx= 3: 1). Solid-state NMR experiments showed that the trigonal form was gradually converted into the monoclinic form on storage in vacuo. On the basis of NMR and X-ray examinations it was concluded that the trigonal form is an inclusion compound of trans-1, 3-bis(3, 4-dimethoxyphenyl)-2-3-epoxy-1-propanone with chloroform. The crystal structure of the trigonal form with space group of R3-bar, a = 36.0354(4), c = 8.2743(2) A, and Z = 18, has been refined to R = 0.0506 by the employment of th SQUEEZE procedure implemented in PLATON-94.
机译:反式1,3-双(3,4-二甲氧基苯基)_2,3-环氧-1-丙酮以单斜晶形式(熔点为155-156摄氏度,来自乙醇)和三角晶形式(熔点为125-126摄氏度)结晶,来自氯仿/己烷或氯仿)。 NMR研究表明,氯仿以三角形式存在(环氧化物/氯仿之比约为3:1)。固态NMR实验表明,在真空中储存后,三角形逐渐转变为单斜晶形式。根据NMR和X射线检查得出的结论是,三角形形式是反式1,3-双(3,4-二甲氧基苯基)-2-3-环氧-1-丙酮与氯仿的包合物。通过使用执行的SQUEEZE程序,已将具有R3-bar,a = 36.0354(4),c = 8.2743(2)A和Z = 18的空间群的三角形式的晶体结构精炼为R = 0.0506。在PLATON-94中。

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