Microwave spectrum and structure of cyclopropene

The microwave spectrum of cyclopropene has been investigated in the region of 18−40 GHz. The two monosubstituted 13C species have been assigned and a centrifugal distortion analysis carried out on the main isotopic species. Structural parameters obtained are r (C1C2) = 1.509±0.001 A, r (C2C2′) = 1.2959±0.0004 A, &C2C1C2′ = 50.84±0.05°, r (CH ethylenic) = 1.072±0.001 A, r (CH methylenic) = 1.088±0.002 A, &C2C2′H = 149.85±0.08°, &HC1H = 114.57±0.19°.

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