The microwave spectrum of the cis-2-butene molecule has been studied between 20 and 40 Gc/sec. Analysis of internal-rotation splittings yields an effective threefold barrier of 0.73 kcal/mole, or 256 cm−1. The principal moments of inertia of the normal isotopic species are 31.479, 98.370, and 123.659 amu·Å2. The electric dipole moment is 0.257 D and lies along the b axis of the molecule.
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T. N. Sarachman (1968) studied this question.
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