GB1499650A - Process for production of 2,3,5,6-tetrachloropyridine - Google Patents

Process for production of 2,3,5,6-tetrachloropyridine

Info

Publication number
GB1499650A
GB1499650A GB43176/76A GB4317676A GB1499650A GB 1499650 A GB1499650 A GB 1499650A GB 43176/76 A GB43176/76 A GB 43176/76A GB 4317676 A GB4317676 A GB 4317676A GB 1499650 A GB1499650 A GB 1499650A
Authority
GB
United Kingdom
Prior art keywords
hcl
ratio
pentachloropyridine
tetrachloropyridine
ncl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB43176/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Priority to GB43176/76A priority Critical patent/GB1499650A/en
Priority to CA263,590A priority patent/CA1056382A/en
Priority to FR7631253A priority patent/FR2367747A1/en
Priority to JP51124760A priority patent/JPS601307B2/en
Priority to DE2647143A priority patent/DE2647143C3/en
Publication of GB1499650A publication Critical patent/GB1499650A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/61—Halogen atoms or nitro radicals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pyridine Compounds (AREA)

Abstract

1499650 Tetrachloropyridine DOW CHEMICAL CO 18 Oct 1976 43176/76 Heading C2C 2,3,5,6-Tetrachloropyridine is prepared by heating a mixture of pentachloropyridine, Zn and HCl in an aqueous medium at a temperature of at least 110‹ C. under at least autogenous pressure with a molar ratio of Zn : pentachloropyridine of 1-2 : 1, HCl : Zn of 0À75- 2À0 : 1 and a weight ratio of water : pentachloropyridine of 0À4-3À0 : 1. The reaction is preferably conducted at 124-160‹ C. with a Zn : C 5 NCl 5 ratio of 1-1À6 : 1, HCl : Zn ratio of 1-1À5 : 1 and weight ratio of water : C 5 NCl 5 of 1-3 : 1 and with an HCl addition rate such that the presence of H 2 gas is just prevented in the reaction vapours. HCl is usually added as the anhydrous gas over a 1-4 hour period. High yields of the 2,3,5,6-isomer are obtained by the present process.
GB43176/76A 1976-10-18 1976-10-18 Process for production of 2,3,5,6-tetrachloropyridine Expired GB1499650A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB43176/76A GB1499650A (en) 1976-10-18 1976-10-18 Process for production of 2,3,5,6-tetrachloropyridine
CA263,590A CA1056382A (en) 1976-10-18 1976-10-18 Preparation of tetrachloropyridine
FR7631253A FR2367747A1 (en) 1976-10-18 1976-10-18 TETRACHLOROPYRIDINE PRODUCTION PROCESS
JP51124760A JPS601307B2 (en) 1976-10-18 1976-10-18 Manufacturing method of tetrachloropyridine
DE2647143A DE2647143C3 (en) 1976-10-18 1976-10-19 Process for the preparation of 233.6-tetrachloropyridine

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB43176/76A GB1499650A (en) 1976-10-18 1976-10-18 Process for production of 2,3,5,6-tetrachloropyridine
CA263,590A CA1056382A (en) 1976-10-18 1976-10-18 Preparation of tetrachloropyridine
FR7631253A FR2367747A1 (en) 1976-10-18 1976-10-18 TETRACHLOROPYRIDINE PRODUCTION PROCESS
JP51124760A JPS601307B2 (en) 1976-10-18 1976-10-18 Manufacturing method of tetrachloropyridine
DE2647143A DE2647143C3 (en) 1976-10-18 1976-10-19 Process for the preparation of 233.6-tetrachloropyridine

Publications (1)

Publication Number Publication Date
GB1499650A true GB1499650A (en) 1978-02-01

Family

ID=27508074

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43176/76A Expired GB1499650A (en) 1976-10-18 1976-10-18 Process for production of 2,3,5,6-tetrachloropyridine

Country Status (5)

Country Link
JP (1) JPS601307B2 (en)
CA (1) CA1056382A (en)
DE (1) DE2647143C3 (en)
FR (1) FR2367747A1 (en)
GB (1) GB1499650A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592810A (en) * 1985-03-18 1986-06-03 The Dow Chemical Company Electrocatalytic production of 2,3,5,6-tetrachloropyridine from pentachloropyridine
US4783536A (en) * 1985-02-07 1988-11-08 The Dow Chemical Company Selective reduction of pentachloropyridine to 2,3,5,6-tetrachloropyridine with zinc dust in basic media

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4996299A (en) 1998-07-15 2000-02-07 Reilly Industries, Inc. Dechlorination of pyridines in acidic, zinc-containing mediums

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4783536A (en) * 1985-02-07 1988-11-08 The Dow Chemical Company Selective reduction of pentachloropyridine to 2,3,5,6-tetrachloropyridine with zinc dust in basic media
US4592810A (en) * 1985-03-18 1986-06-03 The Dow Chemical Company Electrocatalytic production of 2,3,5,6-tetrachloropyridine from pentachloropyridine

Also Published As

Publication number Publication date
JPS601307B2 (en) 1985-01-14
DE2647143A1 (en) 1978-04-27
FR2367747A1 (en) 1978-05-12
DE2647143B2 (en) 1978-08-10
DE2647143C3 (en) 1979-04-05
FR2367747B1 (en) 1979-03-02
CA1056382A (en) 1979-06-12
JPS5350175A (en) 1978-05-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
704A Declaration that licence is not available as of right for an excepted use (par. 4a/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19941018