CHMY271: Newman Projections

Covers definitions and key concepts of Newman projections.

conformations

rotational states; the front carbon eclipses the single bond and the carbon behind it

torsional angle

the angle between H atoms

the __________ conformation is more stable and lower in energy compared to the __________ conformation

staggered | eclipsed

torsional strain

the difference in energy between eclipsed and stagged configurations; takes place when orbital overlap occurs

when staggered, a __________ orbital forms between atoms; it is stabilized by __________ and __________

bonding | M.O. overlap | e- repulsion

gauche

raises energy and is the “middle” configuration; any groups that repel one another experiences this phenomenon

eclipsing

groups that repel each other experience overlappinng; is the least stable

anti

methyl groups are farthest apart and therefore are the most stable; aka the staggered configuration

in __________ configuration, torsional angles are spread out as much as possible, resulting in the highest stability

staggered