"The different arrangements of atoms that result from bond rotation are called conformations, and molecules that have different arrangements are called conformational isomers, or conformers. Unlike constitutional isomers, however, different conformers often can’t be isolated because they interconvert too rapidly. Conformational isomers are represented in two ways, … A sawhorse representation views the carbon–carbon bond from an oblique angle and indicates spatial orientation by showing all C - H bonds. A Newman projection views the carbon–carbon bond directly end-on and represents the two carbon atoms by a circle. Bonds attached to the front carbon are represented by lines to the center of the circle, and bonds attached to the rear carbon are represented by lines to the edge of the circle."
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John McMurry, Organic Chemistry 8th ed. (2012), Ch. 3 : Organic Compounds: Alkanes and Their Stereochemistry
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Conformational isomerism
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