Reference

Pulsed-field-ionization spectroscopy for the study of molecular cations

Pulsed-field-ionization spectroscopy for the study of molecular cations. Takazawa, Ken; Fujii, Masaaki; Ebata, Takayuki; Ito, Mitsuo (Fac. Sci., Tohoku Univ., Sendai 980, Japan). Chem. Phys. Lett., 189(6), 592-7 (English) 1992. CODEN: CHPLBC. ISSN: 0009-2614. DOCUMENT TYPE: Journal CA Section: 73 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Pulsed-field-ionization (PFI) spectroscopy using usual MPI app. 280-57-9 and 352-70-5 are also in the experiment. without any magnetic shielding gives the spectra of mol. cations comparable to those obtained by ZEKE spectroscopy which requires a thorough magnetic shielding. The electrons detected by PFI spectroscopy come from very high Rydberg states of a neutral mol. near the convergence limit. The potential of PFI spectroscopy for the study of the vibrational structures of cations was demonstrated for the cations of DABCO, 1,2,4,5-tetrafluorobenzene and m-fluorotoluene. .

5-Fluorotoluene-2,4-disulfonyl chloride

5-Fluorotoluene-2,4-disulfonyl chloride. Diehl, Herbert; Kaesbauer, Josef; Wedemeyer, Karlfried (Bayer A.-G.In this study， 352-70-5 and 85721-33-1 are also used. , Fed. Rep. Ger.). Ger. Offen. DE 3515870 A1 6 Nov 1986, 9 pp. (Germany) CODEN: GWXXBX. CLASS: ICM: C07C143-70. APPLICATION: DE 85-3515870 3 May 1985. DOCUMENT TYPE: Patent CA Section: 25 (Benzene, Its Derivatives, and Condensed Benzenoid Compounds) Section cross-reference(s): 1 The title compd. (I), useful as an intermediate for antibacterial quinolinone II, is prepd. by chlorosulfonylation of 3-FC6H4Me (III) at 90-100° followed by heating at 150-170° with an inorg. chloride. Thus, 3.60 mol III was treated with 7.25 mol ClSO3H for ~1 h at 97-99° and the mixt. was treated with 4.94 mol SOCl2 and heated for 75 min at 160° to give 98.3% I. .