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IV.A.5.

Compare Barriers to Internal Rotation

Which torsion in CH3COCH2CH3?
picture of 2-Butanone
Please choose which four atoms describe the torsional coordinate.
choose Atom1 Atom2 Atom3 Atom4 Type of Rotor
torsion 1 1 2 3 4 CH2CH3
torsion 2 9 4 3 2 CH3
torsion 3 6 1 2 3 CH3