GB1209056A - Process for the preparation of pyrazinetetracarboxylic dianhydride - Google Patents

Process for the preparation of pyrazinetetracarboxylic dianhydride

Info

Publication number
GB1209056A
GB1209056A GB5365867A GB5365867A GB1209056A GB 1209056 A GB1209056 A GB 1209056A GB 5365867 A GB5365867 A GB 5365867A GB 5365867 A GB5365867 A GB 5365867A GB 1209056 A GB1209056 A GB 1209056A
Authority
GB
United Kingdom
Prior art keywords
anhydride
preparation
nov
temperature
pyrazine tetracarboxylic
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
GB5365867A
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.)
Monsanto Co
Original Assignee
Monsanto 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 Monsanto Co filed Critical Monsanto Co
Publication of GB1209056A publication Critical patent/GB1209056A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D491/00—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00
    • C07D491/12—Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups C07D451/00 - C07D459/00, C07D463/00, C07D477/00 or C07D489/00 in which the condensed system contains three hetero rings
    • C07D491/14—Ortho-condensed systems

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

1,209,056. Pyrazine tetracarboxylic dianhydride. MONSANTO CO. 24 Nov., 1967 28 Nov., 1966], No. 53658/67. Heading C2C. 2,3,5,6-Pyrazine tetracarboxylic anhydride is prepared by mixing 2,3,5,6-pyrazine tetracarboxylic acid with a dehydrating agent and maintaining the temperature of the resulting mixture below 139‹ C. and below the boiling point of the dehydrating agent. The temperature is preferable maintained below 100‹ C. and more preferably between ambient and 80‹ C. Dehydrating agents may be acetic anhydride, propionic anhydride, acetyl chloride or phosphorus pentoxide.
GB5365867A 1966-11-28 1967-11-24 Process for the preparation of pyrazinetetracarboxylic dianhydride Expired GB1209056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59720266A 1966-11-28 1966-11-28

Publications (1)

Publication Number Publication Date
GB1209056A true GB1209056A (en) 1970-10-14

Family

ID=24390527

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5365867A Expired GB1209056A (en) 1966-11-28 1967-11-24 Process for the preparation of pyrazinetetracarboxylic dianhydride

Country Status (1)

Country Link
GB (1) GB1209056A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees