Reference

Symmetrical tetrachloropyridine from chlorinated b-(trichloromethyl)pyridines employing a catalyst

Symmetrical tetrachloropyridine from chlorinated b-(trichloromethyl)pyridines employing a catalyst. Humphreys, Paula Lee; Dietsche, Thomas J. (Dow Chemical Co., USA). Eur. Pat. Appl. EP 204848 A1 17 Dec 1986, 16 pp. DESIGNATED STATES: R: BE, CH, DE, FR, GB, IT, LI, NL. (European Patent Organization) CODEN: EPXXDW. CLASS: ICM: C07D213-61. APPLICATION: EP 85-106739 31 May 1985. DOCUMENT TYPE: Patent CA Section: 27 (Heterocyclic Compounds (One Hetero Atom)) Title 2,3,5,6-tetrachloropyridine (I), known as an intermediate for pesticides (no data), was prepd. from chlorinated b-(trichloromethyl)pyridine with Cl in a liq. phase in presence of FeCl3 catalyst. 6515-09-9 and 2402-79-1 are just another two chemicals used in this study. The method resulted in less byproduct pentachloropyridine formation, an accelerated rate of reaction, and a higher yield of I. .

Separation and identification of chloropyridine isomers and quantitative determination of pentachloropyridine in chlorinated pyridine residues by gas chromatography-mass spectrometry

Separation and identification of chloropyridine isomers and quantitative determination of pentachloropyridine in chlorinated pyridine residues by gas chromatography-mass spectrometry. Husain, Sajid; Krishnamurthy, A. S. R.; Sarma, P. Nageswara (Anal. Div., Reg. Res. Lab., Hyderabad 500 007, India). J. Chromatogr., 285(3), 509-14 (English) 1984. CODEN: JOCRAM. ISSN: 0021-9673. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) Section cross-reference(s): 35, 41, 64 Chloropyridine isomers (2,3,5-trichloropyridine 2,4,6-trichloropyridine, 2,3,4,6-tetrachloropyridine. 2,3,5,6-Tetrachloropyridine, and pentachloropyridine) were sepd. and identified by gas chromatog.-mass spectrometry in chlorinated pyridine residue. 14121-36-9 and 2402-79-1 which are cas registry numbers of substances are two of reagents here. Stainless steel columns packed with 3% or 10% DEGA on Chromosorb WAW or PAW were used. Chloropyridine are intermediates in the prepn. of pesticides, herbicides, dyes, pharmaceuticals, and plastics. .