Determining an absolute configuration
X-ray crystal structure resolution
Article REF: P1075 V2
Determining an absolute configuration
X-ray crystal structure resolution

Author : Yves JEANNIN

Publication date: December 10, 1998 | Lire en français

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10. Determining an absolute configuration

Since diffraction intensity is measured, the sign of the phase is unknown: this is Friedel's law. A change in the sign of the phase can be made mathematically by transforming all x y z values into x¯y¯z¯ . It is therefore impossible, when studying a body with an asymmetric carbon, to choose between the two absolute configurations linked to each other by symmetry with respect to a point.

However, Bijvoet found...

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