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|Title:||Physicochemical properties and the crystallization thermodynamics of the pure enantiomer and the racemate for N-methylephedrine|
|Authors:||Wang, X.J. |
|Source:||Wang, X.J., Wiehler, H., Ching, C.B. (2003-09). Physicochemical properties and the crystallization thermodynamics of the pure enantiomer and the racemate for N-methylephedrine. Journal of Chemical and Engineering Data 48 (5) : 1092-1098. ScholarBank@NUS Repository. https://doi.org/10.1021/je020176b|
|Abstract:||The binary melting point phase diagram of (+)- and (-)-N-methylephedrine was determined. It was shown that (±)-N-methylephedrine is a racemic conglomerate. The enthalpies of fusion of (+)-N-methylephedrine and of (±)-N-methylephedrine and the entropy of mixing of (+)- and (-)-N-methylephedrine were calculated using the thermal data. The nature of the (±)-N-methylephedrine crystalline racemate was also confirmed by means of comparison of solid-state infrared spectra and powder X-ray diffraction patterns of the racemic mixture with those of one of the enantiomers. The solubility and supersolubility diagrams of (±)-N-methylephedrine in a mixed solvent of 2-propanol and water were determined over the temperature range (7 to 30)°C. The ternary phase diagram of (+)- and (-)-N-methylephedrine with the mixed solvent was constructed at (15, 20, 25, and 30)°C.|
|Source Title:||Journal of Chemical and Engineering Data|
|Appears in Collections:||Staff Publications|
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