GB750847A - Improvements in or relating to purification of citrazinic acid - Google Patents

Improvements in or relating to purification of citrazinic acid

Info

Publication number
GB750847A
GB750847A GB7105/54A GB710554A GB750847A GB 750847 A GB750847 A GB 750847A GB 7105/54 A GB7105/54 A GB 7105/54A GB 710554 A GB710554 A GB 710554A GB 750847 A GB750847 A GB 750847A
Authority
GB
United Kingdom
Prior art keywords
purification
relating
acid
citrazinic acid
citrazinic
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
GB7105/54A
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.)
Pfizer Inc
Original Assignee
Pfizer Inc
Charles Pfizer and Co Inc
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 Pfizer Inc, Charles Pfizer and Co Inc filed Critical Pfizer Inc
Publication of GB750847A publication Critical patent/GB750847A/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
    • C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Crude citrazinic acid is purified by contacting with sulphuric acid having a concentration of 65-90 per cent by weight at an elevated temperature, filtering the crystalline solid that forms upon cooling the treatment mixture and contacting said crystalline solid with water to form purified citrazinic acid. The process is preferably conducted with sulphuric acid having a concentration of 70 per cent by weight, and at a temperature of 105-110 DEG C.
GB7105/54A 1953-04-06 1954-03-11 Improvements in or relating to purification of citrazinic acid Expired GB750847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US750847XA 1953-04-06 1953-04-06

Publications (1)

Publication Number Publication Date
GB750847A true GB750847A (en) 1956-06-20

Family

ID=22123437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7105/54A Expired GB750847A (en) 1953-04-06 1954-03-11 Improvements in or relating to purification of citrazinic acid

Country Status (1)

Country Link
GB (1) GB750847A (en)

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