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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > October  >
Information, Textbooks, Media, Resources
Periplanar or Coplanar?
Saul Kane and William H. Hersh
Department of Chemistry and Biochemistry, Queens College of the City University of New York, Flushing, NY 11367-1597
Cover
October 2000
Vol. 77 No. 10
p. 1366
Abstract
The term "periplanar" was coined by Klyne and Prelog in 1960 to define a flexible torsional angle of 0 ± 30° (syn) or 180 ± 30° (anti). The prefix peri, derived from the Greek for "near", was chosen to make the meaning "approximately planar". However, the current common usage of syn and antiperiplanar is planar, which is incorrect. In the interests of proper language, we suggest that future authors instead use "syn-coplanar" and "anti-coplanar".
More Information
*  Citation
 Kane, Saul; Hersh, William H. J. Chem. Educ. 2000 77 1366.
*  Keywords
 Mechanisms; Nomenclature / Units / Symbols; Organic Chemistry; Stereochemistry; Textbooks; Writing in Chemistry
*  History
 Created:
Last Updated:		 September 22, 2000
April 15, 2005
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