GB1499650A - Process for production of 2,3,5,6-tetrachloropyridine - Google Patents
Process for production of 2,3,5,6-tetrachloropyridineInfo
- 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
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.
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)
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)
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 |
-
1976
- 1976-10-18 FR FR7631253A patent/FR2367747A1/en active Granted
- 1976-10-18 CA CA263,590A patent/CA1056382A/en not_active Expired
- 1976-10-18 GB GB43176/76A patent/GB1499650A/en not_active Expired
- 1976-10-18 JP JP51124760A patent/JPS601307B2/en not_active Expired
- 1976-10-19 DE DE2647143A patent/DE2647143C3/en not_active Expired
Cited By (2)
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 |