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IV.A.5.

Compare Barriers to Internal Rotation

Which torsion in CH3CH2CH2CH3?
picture of Butane
Please choose which four atoms describe the torsional coordinate.
choose Atom1 Atom2 Atom3 Atom4 Type of Rotor
torsion 1 3 1 2 4 CH2CH3
torsion 2 2 1 3 9 CH3
torsion 3 2 1 3 9 CH3