title: The infrared and Raman spectra of trans- and cis-tetrachloro-tetramethylbicyclopropylidene.
abstract: The title compounds trans- and cis-2,2,2',2'-tetrachloro-3,3,3',3'-tetramethyl-bicyclopopylidene were synthesized, and their infrared and Raman spectra were recorded. Non-coincidence between the IR and Raman bands of the trans compound suggested C(2h) symmetry and a planar ring system. In the cis compound most of the IR and Raman bands coincided and a C(2v) symmetry seems likely. The exocyclic CC double bond gave rise to a medium/weak Raman band at 1,847 cm(-1) in the trans compound. In the cis derivative IR and Raman bands both at 1,825 cm(-1) were observed. From similarities with related molecules, the ring breathing, the antisymmetric ring stretch, the CCl(2) out-of-phase and in-phase stretch and the out-of-plane ring bending modes have been tentatively assigned for the trans and cis compounds.
authors.affiliation: Department of Chemistry, University of Oslo, P.O. Box 1033, 0315 Oslo, Norway. peter.klaboe@kjemi.uio.no
authors.forename: Peter
authors.initials: P
authors.lastname: Klaeboe
authors.forename: Lars
authors.initials: L
authors.lastname: Skattebøl
mesh_terms: D001643:Bridged Bicyclo Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013237:Stereoisomerism
chemical_list: D001643:Bridged Bicyclo Compounds