Crystal structure of β-d,l-psicose

Ishii T.; Sakane G.; Yoshihara A.; Fukada K.; Senoo T.

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Crystal structure of β-d,l-psicose

机译：β-d，l-庚糖的晶体结构

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The title compound, C6H12O6, a C-3 position epimer of fructose, was crystallized from an aqueous solution of equimolar mixture of d- and l-psicose (1,3,4,5,6-pentahydroxyhexan-2-one, ribo-2-hexulose, allulose), and it was confirmed that d-psicose (or l-psicose) formed β-pyranose with a 2C5 (or 5C2) conformation. In the crystal, an O—H⋯O hydrogen bond between the hydroxy groups at the C-3 and C-2 positions connects homochiral molecules into a column along the b axis. The columns are linked by other O—H⋯O hydrogen bonds between d- and l-psicose molecules, forming a three-dimensional network. An intramolecular O—H⋯O hydrogen bond is also observed. The cell volume of racemic β-d,l-psicose [763.21 (6) Å3] is almost the same as that of chiral β-d-psicose [753.06 Å3].

机译：标题化合物C6H12O6（果糖的C-3位置差向异构体）从d-和l-庚糖（1,3,4,5,6-五羟基己二-2-酮，核糖- 2-己糖，阿洛糖），并证实d-庚糖（或l-庚糖）形成具有2C5（或5C2）构象的β-吡喃糖。在晶体中，C-3和C-2位置的羟基之间的O-H = O氢键将同手性分子沿b轴连接成一列。这些柱通过d-和l-蔗糖分子之间的其他OH-H = O氢键连接，形成三维网络。还观察到了分子内的OHH氢键。外消旋β-d-阿胶[763.21（6）63]的细胞体积与手性β-d-阿胶[753.06 3]几乎相同。

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《Acta Crystallographica Section E: Crystallographic Communications》 |2015年第5期|共页
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Ishii T.; Sakane G.; Yoshihara A.; Fukada K.; Senoo T.;
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Crystal structure of β-d,l-psicose

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