Anti-Periplanar Conformation Definition

Definition of Anti-Periplanar Conformation

Butane Anti-periplanar Conformation
This shows butane in the anti-periplanar conformation in sawhorse and Newman projections. Todd Helmenstine

Anti-Periplanar Definition: Anti-periplanar refers to a periplanar conformation where the dihedral angle between two atoms or groups of atoms is  between ±150° and 180°.

The image shows butane (C4H10) in a syn-periplanar conformation where the two methyl groups (-CH3) are lined up with a 180° angle.

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Helmenstine, Anne Marie, Ph.D. "Anti-Periplanar Conformation Definition." ThoughtCo, Jun. 21, 2014, thoughtco.com/anti-periplanar-conformation-definition-603388. Helmenstine, Anne Marie, Ph.D. (2014, June 21). Anti-Periplanar Conformation Definition. Retrieved from https://www.thoughtco.com/anti-periplanar-conformation-definition-603388 Helmenstine, Anne Marie, Ph.D. "Anti-Periplanar Conformation Definition." ThoughtCo. https://www.thoughtco.com/anti-periplanar-conformation-definition-603388 (accessed January 18, 2018).