Microwave Spectra of Methylcyclopropanes. II. Methylcyclopropane

Abstract

The microwave spectrum of methylcyclopropane was observed in the range 8–38 GHz. The barrier to internal rotation of the methyl group was determined as 2860 ± 50 cal/mole from splittings of the rotational transitions. The dipole moment was found to be: ${\mu }_A\text{\hspace{0.17em}=\hspace{0.17em}0.097\hspace{0.17em}±\hspace{0.17em}0.001}\mathrm{D}{\mathrm{,\; \mu }}_C\text{\hspace{0.17em}=\hspace{0.17em}0.100\hspace{0.17em}±\hspace{0.17em}0.005}\mathrm{D}$ , and ${\mu }_{\mathrm{total}}\text{\hspace{0.17em}=\hspace{0.17em}0.139\hspace{0.17em}±\hspace{0.17em}0.004}\mathrm{D}$ .