UNC-Chapel Hill CHEM 261 - Newman Projections (2 pages)

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Newman Projections



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Newman Projections

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What are Newman projections? How does the geometry of a molecule affect it?


Lecture number:
10
Pages:
2
Type:
Lecture Note
School:
University of North Carolina at Chapel Hill
Course:
Chem 261 - INTRO ORG CHEM I Lecture 3

Unformatted text preview:

Chem 261 1nd Edition Lecture 10 Outline of Last Lecture II Interactions III Nomenclature Outline of Current Lecture IV Newman Projection V Interactions VI Bonding Geometry Current Lecture A Newman projection useful in alkane stereochemistry visualizes chemical conformations of a carbon carbon chemical bond from front to back with the front carbon represented by a dot and the back carbon as a circle Wikipedia The first image represents eclipsed forms where the hydrogens are parallel This is unfavorable The second image represents staggered conformation this is favorable because the bonds are as far away from each other as possible The cost of a single H H eclipsing interaction is 1 kcal mol so it is not a significant difference but needs to be discussed These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Angle strain occurs when the geometry of the molecule prevents the orbital from overlapping at its best angle



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