Absolute structure of R-(-)-2-methylpiperazine and S-(+)-2-methylpiperazine

作者：Reibenspies Joseph^*; Bhuvanesh Nattamai

来源：Acta Crystallographica Section B-Structural Science, 2013, 69(3): 288-293.

DOI：10.1107/S2052519213008713

The absolute structures of R-(-)-2-methylpiperazine (rmpip), S-(+)-2-methylpiperazine (smpip), R-(-)-2-methylpiperazine-diium dibromide (rmpipBr) and S-(+)-2-methylpiperazine-diium dibromide (smpipBr) have been determined by anomalous dispersion employing the Parsons' Q and Hooft methods. The studies were undertaken to determine the limitations of the absolute structure determination of light element structures (C, H, N) employing routine single-crystal X-ray diffraction laboratory conditions. The structures of the neutral methylpiperazines were known from a priori non-crystallographic methods and were confirmed by the absolute structure determination of their dibromide salts. By employing the full data collection of Bijvoet pairs and minimizing systematic errors, the absolute structure parameters 0.09 (8) (Hooft) for R-(-)-2-methylpiperazine and 0.05 (8) (Hooft) for S-(+)-2-methylpiperazine were determined.

• 出版日期2013-6