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Atropisomers

 

IUPAC Atropisomers is defined as following

A subclass of conformers which can be isolated as separate chemical species and which arise from restricted rotation about a single bond, e.g. ortho-substituted biphenyl, 1,1,2,2-tetra-tert-butylethane.

The word atropisomer is derived from the Greek a, meaning not, and tropos, meaning turn. The name was coined by Kuhn in 1933, but atropisomerism was first detected in 6,6’-dinitro-2,2’-diphenic acid by Cristie in 1922.

References:

  1. PAC, 1996, 68, 2193 (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2200
  2. http://www.sciencemag.org/cgi/content/abstract/328/5983/1251
  3. http://pubs.acs.org/doi/abs/10.1021/ja109165f
  4. http://pubs.acs.org/doi/abs/10.1021/ja109164t
  5. Wiki Article
  6. axial chirality
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