quasiracemate (+)-1/(−)-2·Im are organized by approximate inversion symmetry. Assessment of the crystalpacking efficiency for this series of molecular salts via crystal densities and packing coefficients (Ck) indicates imidazole greatly alters the crystal landscape of the system in favor of racemic and quasiracemic crystalpacking. A similar desymmetrized crystal environment was also realized for the ternary
Levene; Haller, Journal of Biological Chemistry, 1929, vol. 83, p. 183
作者:Levene、Haller
DOI:——
日期:——
Pasteur-like resolution of quasi-racemates in solid and gas phases
作者:Remir G. Kostyanovsky、Eugene N. Nikolaev、Oleg N. Kharybin、Gul’nara K. Kadorkina、Vasilii R. Kostyanovsky
DOI:10.1070/mc2003v013n03abeh001801
日期:2003.1
Isotopomeric quasi-racemates (IQR), i.e., 1:1 mixtures of enantiomers one of which contains an isotopic label, can undergo crystallisation as conglomerates or true quasi-racemates. In the former case, each single crystal contains, predominantly or exclusively, either labelled or non-labelled enantiomers, whereas in the latter case, it contains both enantiomers (1:1). If solution sputtering is used to ionise quasi-racemates, the formation of homochiral protonated and metallated enantiomers and their homochiral oligomers in the gas phase is detected in ion cyclotron resonance (ICR) mass spectra; these compounds differ in their m/z values; hence, Pasteur-like 'manual sorting' can be employed to catch them successively in the ion trap of the spectrometer.
Holmberg, Chemische Berichte, 1926, vol. 59, p. 132
作者:Holmberg
DOI:——
日期:——
Olson; Long, Journal of the American Chemical Society, 1934, vol. 56, p. 1295