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By R. Gobel

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In addition to this, carefully measured differences in the chiroptical properties of octahedral cobalt and iridium enantiomers were observed by Andrea Szab´o-Nagy and Lajos Keszthelyi (1999). Also, these authors considered the recorded differences between enantiomers as being caused by parity non-conserving energy differences. These and other experimental trials to ultimately evaluate parity non-conserving energy differences will be exposed in Chap. 5. As a consequence of this attractive and far-reaching theory based on the asymmetry of the weak nuclear force it has consequently been acknowledged that even atoms are principally optically active and that L- and D-molecules are truly diastereoisomers instead of enantiomers in the strict sense of the term (MacDermott 1993).

The handedness of the enantiomeric excess achieved in these experiments was induced by the relative orientation of the non-circularly polarized light towards the magnetic field. May such a magnetochiral anisotropy have been decisive for life’s selection of its enantiomerically pure molecular building blocks? The answer will be given in Chap. 6, where we will see that the Earth’s magnetic field is, referring to the authors’ conclusion, too weak and periodically changing over geological time periods its direction, to have a suitable effect.

Stereodescriptors are aR, if the substituents’ priority rotates in a clockwise manner, and aS for anti-clockwise rotation. Helical chirality, a special case of axial chirality, is given when a molecular structure describes the form of a helix around an axis. If the molecule describes a helix in a clockwise manner away from the viewer, we call it a P-helix (P for plus), if it rotates in an anticlockwise manner away from the viewer, it is called a M-helix (M for minus). In DNA (P-helix), starch, and proteins (P-helix), helical chirality is of importance.

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