#Newman projections - General Organic Chemistry Representation CSIR NET, IIT JAM, GATE IN HINDI

Conversion of #Newman, Sawhorse and Fischer projection || Dash and Wedge formula Newman Projections - Anti, Gauche, Staggered, Eclipsed Energy Diagrams / Stability Organic Chemistry This organic chemistry video tutorial provides a basic introduction into newman projections. It explains how to draw the newman projections of ethane, butane, and 2,3-dimethylpentane. It explains how to draw the eclipsed and staggered conformations of ethane as well as the gauche and anti conformations of butane. It explains how to use conformational analysis to determine which conformation is most stable. newman projections stability newman projections quiz newman projections khan academy newman projection generator drawing newman projections from wedge dash newman projection of ethane newman projection of butane newman projection formula of propane Page navigation A Newman projection, useful in alkane stereochemistry, visualizes the conformation of a chemical bond from front to back, with the front atom represented by a dot and the back carbon as a circle. The front carbon atom is called proximal, while the back atom is called distal. This type of representation clearly illustrates the specific dihedral angle between the proximal and distal atoms.[1] This diagram style is an alternative to a sawhorse projection, which views a carbon-carbon bond from an oblique angle, or a wedge-and-dash style, such as a Natta projection. These other styles can indicate the bonding and stereochemistry, but not as much conformational detail. This projection is named after American chemist Melvin Spencer Newman, who introduced it in 1952 as partial replacement for Fischer projections, which are unable to represent conformations and thus conformers properly.[2][3] A Newman projection can be used to visualize any sort of bond, not just a single bond between carbons of an alkane. For example, it can be used to study cyclic molecules,[2] such as the chair conformation of cyclohexane: In a Newman projection, we look along a carbon-carbon bond. The front carbon is represented as a dot and the back carbon as a circle. The sustituents attached to the front carbon all have bonds starting from the dot while the substituents attached to the back carbon have bonds starting from the circle. If you look at a Newman projection, you can see that it is a 'compact' version of the sawhorse projection. As an example, see below how the 2 enantiomers of 2- Butanol are represented using the Sawhorse and Newman projections: At university, you will learn that compounds can exist in different conformations and that chiral carbons can have 2 different configurations that you will learn to assign using 3D representations. That is why it is important to be able to represent molecules in 3D using different representations but also to understand how to draw one representation of a molecule starting from another. With a bit of practice, you will then be able to say whether 2 different representations of a chemical correspond to the same compound, enantiomers or something else. Below is an example of how to go from a Newman projection to a Sawhorse projection using wedge and dash for one enatiomer of 2-Butanol: