Intermediate Topic 756 of 1102 Organic Chemistry
Newman Projections
Views along a C-C bond showing staggered and eclipsed conformations.
In-depth explanation of Newman Projections
A Newman projection views a molecule down a single carbon-carbon bond, with the front carbon shown as a point and the rear carbon as a circle. The three bonds from each carbon are drawn as lines radiating from the centre, which makes it easy to see the angle between groups on adjacent carbons. A staggered conformation places front and rear bonds 60 degrees apart and has lower energy than an eclipsed conformation, where they line up. In butane, the anti staggered arrangement is the most stable because the two largest groups are as far apart as possible.
Going deeper: Newman Projections
Key ideas: View down one C-C bond: the front carbon is a point where three bonds meet, the back carbon is a circle. Staggered has 60 degree dihedral angles, eclipsed has 0. Plot energy versus dihedral angle from 0 to 360 degrees to get the profile. For butane, the three staggered forms are one anti at 180 degrees and two gauche at 60 and 300 degrees.
Common mistakes and connections: Common errors are drawing back-carbon groups aligned with the front when they should be offset, and misidentifying gauche versus anti. Students also forget that front and back carbons each carry three substituents. Links to conformations, cyclohexane chairs and E2 stereochemistry (anti-periplanar geometry).
Visualization of Newman Projections
Butane viewed along C2-C3: anti is lowest, gauche about 3.8 kJ/mol higher, and the fully eclipsed methyl-methyl form near 22 kJ/mol. The interactive lesson shows this as a live animation or chart.
Worked example and use case
In ethane, the eclipsed conformation lies about 12 kJ/mol above the staggered conformation.
Frequently asked questions about Newman Projections
What is Newman Projections?
Views along a C-C bond showing staggered and eclipsed conformations.
Is Newman Projections a beginner, intermediate or advanced topic?
Newman Projections is a intermediate topic in Organic Chemistry. It builds on the vocabulary of beginner topics in this area.
What should I learn before Newman Projections?
Study these earlier topics in Organic Chemistry first: CIP Priority Rules, Fischer Projections, Conformations.
What comes after Newman Projections?
The next topics in Organic Chemistry are Cyclohexane Chair Conformation and Ring Strain.
Can I practise Newman Projections with quizzes?
Yes. The interactive lesson includes a self-check question on Newman Projections, and the Organic Chemistry quiz draws on every topic in this area.
Where Newman Projections fits in Organic Chemistry
Newman Projections is topic 28 of 148 in Organic Chemistry.