(60 degrees was the end part)
I don't get why...
in my experiment we found that C-1-C-2-C-3 bond angle at gauche was 113.46 degrees
C1-C-2-C-3-C-4 dihedral angle at gauche was 65.30 degrees
and H-C-1-C-2-C-3 dihedral angle at gauche was 65.71 degrees
does it have something w/ having less molecules in the first one (not dihedral)?
a rotation of 60 or greater will move the methyl groups further apart (assuming a view thru the C2-C3 carbons). as the methyl groups get further apart, the energy decreases...
~ 11 kJ at 0 vs ~ 3.8 or 0 kJ at 60 or, say 180
this is due to the torsional strength, as well as the steric strength of the e- trying to get as far away from eachother as possible.
Conformations Of Butane
It has to do with the gauche, or GOO-ch, better known as the "grundle," or "ABC" standing for *** Ball Connection.... It can get rather hot even at low energy activity.