Title:
PROCESS FOR THE MANUFACTURE OF 2,3-DICHLOROPYRIDINE
Document Type and Number:
WIPO Patent Application WO2005070888
Kind Code:
A3
Abstract:
A method for preparing 2,3-dichloropyridine is disclosed in which 3-amino-2-chloropyridine is contacted with an alkali metal nitrite in the presence of aqueous hydrochloric acid to form a diazonium salt; and the diazonium salt is subsequently decomposed in the presence of copper catalyst wherein at least about 50% of the copper is the copper(II) oxidation state.
Inventors:
SHAPIRO RAFAEL (US)
Application Number:
PCT/US2005/002462
Publication Date:
October 20, 2005
Filing Date:
January 21, 2005
Export Citation:
Assignee:
DU PONT (US)
SHAPIRO RAFAEL (US)
SHAPIRO RAFAEL (US)
International Classes:
C07D213/61; C07D213/73; C07D213/82; (IPC1-7): C07D213/61; C07D213/73; C07D213/82
Foreign References:
| DE1695659B1 | 1971-12-16 | |||
| US3838136A | 1974-09-24 | |||
| US4082749A | 1978-04-04 |
Other References:
HERTOG DEN H J ET AL: "THE CHLOROPYRIDINES", RECUEIL DES TRAVAUX CHIMIQUES DES PAYS-BAS, ELSEVIER SCIENCE PUBLISHERS. AMSTERDAM, NL, vol. 69, 1950, pages 673 - 699, XP008048639, ISSN: 0165-0513
ECKEHARD V. ET AL.: "Synthesis of orellanine, the lethal poison of a toadstool", TETRAHEDRON LETTERS., vol. 26, no. 40, 1985, NLELSEVIER SCIENCE PUBLISHERS, AMSTERDAM., pages 4903 - 4906, XP002334741
DATABASE CROSSFIRE BEILSTEIN [online] BEISTEIN INSTITUT ZUR FOEDERUNG DER CHEMISCHEN WISSENSCHAFTEN, DE; 1988, XP002334748, Database accession no. BRN 1098214
DATABASE CROSSFIRE BEILSTEIN [online] BEISTEIN INSTITUT ZUR FOEDERUNG DER CHEMISCHEN WISSENSCHAFTEN, DE; 1988, XP002334749, Database accession no. BRN 383619
ECKEHARD V. ET AL.: "Synthesis of orellanine, the lethal poison of a toadstool", TETRAHEDRON LETTERS., vol. 26, no. 40, 1985, NLELSEVIER SCIENCE PUBLISHERS, AMSTERDAM., pages 4903 - 4906, XP002334741
DATABASE CROSSFIRE BEILSTEIN [online] BEISTEIN INSTITUT ZUR FOEDERUNG DER CHEMISCHEN WISSENSCHAFTEN, DE; 1988, XP002334748, Database accession no. BRN 1098214
DATABASE CROSSFIRE BEILSTEIN [online] BEISTEIN INSTITUT ZUR FOEDERUNG DER CHEMISCHEN WISSENSCHAFTEN, DE; 1988, XP002334749, Database accession no. BRN 383619
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