Microwave Spectrum, Dipole Moment, and Barrier to Internal Rotation of 1-Methylcyclobutene

Abstract
The microwave spectrum of 1‐methylcyclobutene was observed in the range 8–38 GHz. The potential barrier hindering the internal rotation of the methyl group was determined to be 1666 cal/mole and V6 to be −39 cal/mole. The dipole moment was found to be μa = 0.322 D, μb = 0.156 D, and μtotal = 0.357 D .
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