首页> 美国卫生研究院文献>Acta Crystallographica Section E: Crystallographic Communications >Inversion dimers dominate the crystal packing in the structure of trimethyl citrate (trimethyl 2-hy­droxy­propane-123-tri­carboxyl­ate)
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Inversion dimers dominate the crystal packing in the structure of trimethyl citrate (trimethyl 2-hy­droxy­propane-123-tri­carboxyl­ate)

机译:反相二聚体主导柠檬酸三甲酯(2-甲基2-羟基丙烷-123-三羧酸甲酯)的晶体堆积

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摘要

Trimethyl citrate, C9H14O7 (systematic name: trimethyl 2-hy­droxy­propane-1,2,3-tri­carboxyl­ate), >2, was prepared by the esterification of citric acid and methanol in the presence of thionyl chloride at 273 K. The bond lengths and angles in >2 compare closely with those observed in citric acid. The C—C bonds adjacent to the terminal carboxyl groups are significantly shorter than those around the central C atom. The central carboxyl­ate group and the hy­droxy group occur in the normal planar arrangement with an r.m.s. deviation of 0.0171 Å from the mean plane involving all six atoms in the central unit. The crystal structure is almost completely dominated by the formation of inversion dimers through an O—H⋯O hydrogen bond, together with an extensive array of weaker C—H⋯O contacts. These generate a three-dimensional network structure with mol­ecules stacked along the c-axis direction.
机译:柠檬酸三甲酯C9H14O7(系统名称:2-羟基丙烷三甲基1,2,3-三羧酸三甲酯)> 2 ,是在柠檬酸和甲醇在亚硫酰氯存在下于273 K下酯化制备的。 。> 2 中的键长和键角与在柠檬酸中观察到的键长和角非常接近。与末端羧基相邻的CC键明显短于中心C原子周围的CC键。中心羧酸根基团和羟基在正常平面排列中以r.m.s出现。与中心单元中所有六个原子的平均平面的偏差为0.0171Å。晶体结构几乎完全由通过O-H = O氢键形成的反向二聚体以及大量较弱的C-H = O接触构成。这些生成具有沿c轴方向堆叠的分子的三维网络结构。

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