title: Mass spectra of 3,3-difluoro-1-halo-2-arylcyclopropenes.
abstract: The electron ionization (EI) mass spectra of a series of 3,3-difluoro-1-halo-2-arylcyclo- propenes (1, 2) give the fragments [M-X](+) (X: Br, Cl) as the base peaks. A comparison of tandem mass spectrometry (MS/MS) profiles of the m/z 151 ions recorded from compounds 1 and 2 and 3-bromo-3,3-difluoro-1-phenylcyclopropyne (5), 1,1,2,2-tetrafluoro-3-phenyl- cyclopropane (6), 1,1,2,2-tetrafluoroindane (7), and 2,3,3-trifluoroindene (8) suggested that the structure of the derived [M-X](+) fragment ion is more likely that of a substituted cyclopropenium ion. The results from calculations using the density functional theory (DFT) method support this MS/MS analysis.
authors: Department of Applied Chemistry, Providence University, 200 Chung-Chi Road, Sha-Lu, Taichung 43301, Taiwan.
authors: Mei-Fang
authors: MF
authors: Ding
authors: Shaw-Tao
authors: ST
authors: Lin
authors: Chung-Hong
authors: CH
authors: Hong