Newman projection

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Consideration of the n -butane along the bond between carbon atoms 2 and 3.
Conformers of the n -Butans in Newman projection.

The Newman projection , which was introduced by Melvin Spencer Newman , is one of several possibilities to represent the three-dimensional molecule in two-dimensional representation. The molecule to be displayed is viewed along the axis of rotation of a selected single bond .

use

The Newman projection is suitable for representing the conformation of a molecule. In the case of alkanes, a distinction is made between various conformers , including rotamers, based on their torsion angle . It is also suitable for describing reaction mechanisms and predicting the stereochemistry of a reaction product, for example according to Cram's rule .

Other modes of representation

Individual evidence

  1. ↑ Stereochemistry: Basic Concepts, by Karl-Heinz Hellwich . books.google.de. Retrieved December 19, 2009.

literature

  • MS Newman: A notation for the study of certain stereochemical problems , in: J. Chem. Educ. 1955, 32, 344-347 .