Infra-Red Spectrum and Depolarization Factors of the Raman Lines of Spiropentane and the Raman and Infra-Red Spectra of 1,1-Dimethylcyclopropane,1 1-Methylcyclobutene, and Methylenecyclobutane

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Abstract
The infra‐red absorption spectrum in the region 700–4000 cm−1, both for the liquid and for the gas at various pressures, and precise values for the depolarization factors of the Raman lines of spiropentane are reported. Infra‐red and Raman frequencies, estimated relative intensities, and qualitative depolarization data are reported also for 1,1‐dimethylcyclopropane. Selection rules for the two hydrocarbons are discussed, and it is shown that the observed numbers of Raman frequencies are not inconsistent with the structures D2d and C2v for the spiropentane and 1,1‐dimethylcyclopropane, respectively. In addition, Raman and infra‐red data are included for the isomers, 1‐methylcyclobutene and methylenecyclobutane. Tentative assignments of the fundamentals are made for each of the four hydrocarbons.