RAMAN, INFRARED AND C-13 NMR-STUDIES OF MIXED HALIDES OF CYCLOPROPENE, C3CLNBR4-N, AND CYCLOPROPANE, C3CLNBR6-N

Tetrachlorocyclopropene, C3Cl4, is converted into C3Br4 by treatment w ith BBr3. Use of less than the stoichiometric amount of BBr3 leads to mixed halides C3C/Br-4-n which are identified and investigated by Rama n and C-13 NMR spectroscopy. The addition of Br-2 to C3Cl4 yields both the isomers cis- and trans-1,2-dibromotetrachlorocyclopropane in equa l quantities; the vibrational spectra are reported and partially assig ned Raman and C-13 NMR of other mixed halides of cyclopropane, C3ClnBr 6-n are discussed A Cl-35/Cl-37 isotope effect is detected on the carb on chemical shift of C3Cl6 . I-2 fails to react with C3Cl4 or C3Br4.