CHEM 123 Lecture Notes - Lecture 27: Cyclohexane Conformation, Newman Projection, Bond Length
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CHEM 123 Full Course Notes
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>switch from models to models for cyclohexane: standard 2d line-bond diagram (wedge/dash) a. b, standard line-bond chair conformation & other standard line-bond chair conformation a, newman projection a. >chair flip (pull c4 up and pull c1 down in cyclohexane ring) Note: boat conformation has higher e steric strain. Which chair favored at eqm?: size of substituent-larger molecule-increase e, can lower to equatorial via ring flip, shape/geometry of substituent groups b. i. Bulky (isopropyl group) or long & skinny (butyl group) b. ii. 1. b. ii. 2. b. ii. 3. Go from 1st c kink (length does not interact) Fewer branches better (adding length away ok: bond length-smaller length, more crowded as you go up and right on the periodic table a. i. Increase #shells & size: problem: i ~ ch3 (same size) b. i. Solve by estimating bond length via location of valence electron b. i. 1. b. i. 2. # shells i > # shells in c.
