If a reaction gave the enantiomer of a known configuration, as indicated by the opposite sign of optical rotation, it would indicate that the absolute configuration is inverted.
22.
Alliin and related substrates found in nature are absolute configuration, and alliin itself was the first natural product found to have both carbon-and sulfur-centered stereochemistry.
23.
It is possible in rare cases that two substituents on an atom differ only in their absolute configuration ( " R " or " S " ).
24.
The available win, loss, and draw conditions include checkmate, stalemate, repetition, piece capture, absolute configuration, relative configuration, and various types of piece count.
25.
In 1951 Johannes Martin Bijvoet for the first time used in X-ray crystallography the effect of anomalous dispersion, which is now referred to as resonant scattering, to determine absolute configuration.
26.
In their later publication in " Nature ", entitled " Determination of the absolute configuration of optically active compounds by means of X-rays ", the authors conclude that:
27.
In 1951, using an X-ray tube with a zirconium target, Bijvoet and his coworkers Peerdeman and van Bommel achieved the first experimental determination of the absolute configuration of sodium rubidium tartrate.
28.
This chiral molecule is typically used, in nonracemic form, as a chiral shift reagent in nuclear magnetic resonance spectroscopy, in order to simultaneously determine absolute configuration and enantiomeric purity of other chiral molecules.
29.
As enantiomers of each other, the homochiral complexes catalyze the reaction at the same rate, although opposite absolute configuration of the product is induced ( i . e . r RR = r SS ).
30.
The determination of absolute configuration is nowadays achieved using " soft " X-ray radiation, most often generated with a copper target ( which generates X-rays with a characteristic wavelength of 154 pm ).
