Chem 220a Problem
Set 2 Due
(a) CH3-CH2-CH2-CH=CH2 (bp 30°), CH3-CH2-CH2-CH2-CH=CH2
(b) CH3-CH2-CH2-CH2-CH2-CH2-Br (bp 155°), CH3-CH2-CH2-CH2-Br
(a) has more than three carbons and has only primary hydrogens.
(b) has seven carbons and has only secondary hydrogens.
(c) has a molecular weight of 84.2.
(b) Estimate the relative energies
of these conformers and sketch the graph of dihedral angle vs. relative energy.
(The relative energies should be estimated to one decimal place, e.g., 3.2 kcal/mol.)
7. Draw the most stable chair conformation for each of the four isomeric 1,3,4-trimethylcyclohexanes.