Atropisomers

Conformers Restricted Rotation Stereochemical Elucidation

 

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

- the Red Book -

International Union of Pure and Applied Chemistry IUPAC nomenclature
Nomenclature of Inorganic ChemistryIUPAC Recommendations 2005


This new edition of the 'Red Book' clarifies and updates recommendations concerning the names and formulae of inorganic compounds and reflects major recent developments in inorganic chemistry. Moreover, it presents recommendations fully consistent with the principles of the nomenclature of organic chemistry. In order to choose the most appropriate of the various nomenclature systems described, a flowchart is provided to guide the reader to a section or chapter where rules can be found for a particular type of compound or species. Copious examples are supplemented by an extensive subject index.




http://old.iupac.org/publications/books/rbook/Red_Book_2005.pdf

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