Add time:07/25/2019 Source:sciencedirect.com
The infrared spectra of trans-1,1-dichloro-2,3-dimethylcyclopropane and trans-1,1-dibromo-2,3-dimethylcyclopropane as liquids and polycrystalline solids have been measured. The gas-phase infrared spectrum of trans-1,1-dichloro-2,3-dimethylcyclopropane was also recorded from 4000 to 400 cm−1. Raman spectra of the two compounds in the liquid phase have been obtained as well. An assignment of the vibrational frequencies has been proposed and discussed. A large number of fundamentals of the parent hydrocarbon are essentially unaffected by halogen substitution. Group frequencies like the ring pulsation and ring deformation modes are slightly, but characteristically shifted by halogen substitution. There is no indication of substantial steric crowding in these molecules.
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