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Item _chemical.absolute_configuration


Description 

              Necessary conditions for the assignment of
               _chemical.absolute_configuration are given by H. D. Flack and
               G. Bernardinelli (1999, 2000).

               Ref: Flack, H. D. & Bernardinelli, G. (1999). Acta Cryst. A55,
                       908-915. (http://www.iucr.org/paper?sh0129)
                    Flack, H. D. & Bernardinelli, G. (2000). J. Appl. Cryst.
                       33, 1143-1148. (http://www.iucr.org/paper?ks0021)

Category

chemical

Mandatory Code

no

Data Type Code

code

Enumeration Values

Item Value Description
rm absolute configuration established by the structure determination of a compound containing a chiral reference molecule of known absolute configuration
ad absolute configuration established by anomalous-dispersion effects in diffraction measurements on the crystal
rmad absolute configuration established by the structure determination of a compound containing a chiral reference molecule of known absolute configuration and confirmed by anomalous-dispersion effects in diffraction measurements on the crystal
syn absolute configuration has not been established by anomalous-dispersion effects in diffraction measurements on the crystal. The enantiomer has been assigned by reference to an unchanging chiral centre in the synthetic procedure
unk absolute configuration is unknown, there being no firm chemical evidence for its assignment to hand and it having not been established by anomalous-dispersion effects in diffraction measurements on the crystal. An arbitrary choice of enantiomer has been made
n.a. inapplicable

Alias Names

Alias Name Dictionary Version
_chemical_absolute_configuration cif_core.dic 2.3

 

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