Microwave Spectrum, Structure, and Quadrupole Coupling Constants of Spiropentyl Chloride

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Abstract
The microwave spectra of C5H735Cl and C5H737Cl have been observed and analyzed. If the spiropentane ring is assumed to be in the D2d configuration, with methylene‐group parameters similar to cyclopropyl chloride, the following parameters are calculated from the observed moments of inertia: r(CCl)=1.74 Å, r(CC)=1.51 Å, and ∠RCCl=118°. The quadrupole coupling constants in the inertial axis system have been obtained for both isotopic species. For the 35Cl species, the values are χaa=−30.98 MHz, χbb=6.22 MHz, and χcc=24.76 MHz. Evidence is presented which indicates that the chemical bond linking the chlorine to the ring is not axially symmetric and does not lie along the C–Cl internuclear line.

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