Sketch curves similar to the one given in Fig. 4.8 showing the energy changes that arise from rotation about the C2-C3 bond of
(a) 2,3-dimethylbutane and
(b) 2,2,3,3-etramethylbutane. You need not concern yourself with actual numerical values of the energy changes, but you should label all maxima and minima with the appropriate conformations.
In Figure 4.8

Transcribed Image Text:

H3C CH3 H CH3 H CH Eclipsed IV CH HaC Eclipsed VI Eclipsed H 19 kJ mol-1 16 kJ mol1 16 kJ mot 3.8 KJ mol-1 3.8 KJ mol1 CH3 CHa CH2 CH3 H2C CH3 Anti 1 Anti I Gauche Ⅲ Gauche V 360 0o 60° 120 180 240 Rotation