The nadir (UK: /ËnÃ¦dÉªÉr/), (US: /ËneÉªdÉªÉr/) (from Arabic: ÙØ¸ÙØ±ââ / ALA-LC: naáºÄ«r, meaning counterpart) is the direction pointing directly below a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface there.
Asymmetric hydrogenation is a chemical reaction that adds two atoms of hydrogen preferentially to one of two faces of an unsaturated substrate molecule, such as an alkene or ketone.ne of these is in the asymmetric hydrogenation of N-unfunctionalized imines to give primary amines. Such species can be difficult to selectively reduce because they tend to exist in complex equilibria of imine and enamine tautomers, as well as (E) and (Z) isomers.
asymmetry means carbon atom attached to four different gps or atoms e.g.CFClBrH.& if mirror image non superimposable disymmetry. if more than one chiral carbon than molecule may be O.A. or Optically inactive e.g.Tartatic acid is O.A. when two OH gps r opp side . when Two OH gps r on same side mesotartaric acid O.inactive.our hands r the best e.g. of ...