GB917974A - Process for the production of m- and p-difluorobenzenes - Google Patents

Process for the production of m- and p-difluorobenzenes

Info

Publication number
GB917974A
GB917974A GB316160A GB316160A GB917974A GB 917974 A GB917974 A GB 917974A GB 316160 A GB316160 A GB 316160A GB 316160 A GB316160 A GB 316160A GB 917974 A GB917974 A GB 917974A
Authority
GB
United Kingdom
Prior art keywords
cooled
fluoborate
acid
difluorobenzenes
give
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
GB316160A
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Deutsche Gold und Silber Scheideanstalt
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 Degussa GmbH, Deutsche Gold und Silber Scheideanstalt filed Critical Degussa GmbH
Publication of GB917974A publication Critical patent/GB917974A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens

Landscapes

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

Abstract

Meta- and para-difluorobenzenes are prepared from the corresponding amines by the fluoborate process, wherein the diazotisation and the conversion to the corresponding diazonium fluoborate is carried out in concentrated sulphuric acid. In examples a mixture of sodium nitrite and concntrated sulphuric acid is cooled and a solution of m- or p-phenylene-diamine in acetic acid is added, the mixture is cooled, filtered to remove sodium hydrogen sulphate, and washed with acetic acid. The solution of diazonium compound is cooled and reacted with fluoboric acid to give the fluoborate which is decomposed by heating to 210 DEG C. to give m- or p-difluorobenzene.
GB316160A 1959-02-05 1960-01-28 Process for the production of m- and p-difluorobenzenes Expired GB917974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED29942A DE1096889B (en) 1959-02-05 1959-02-05 Process for the production of m- and p-difluorobenzene

Publications (1)

Publication Number Publication Date
GB917974A true GB917974A (en) 1963-02-13

Family

ID=7040291

Family Applications (1)

Application Number Title Priority Date Filing Date
GB316160A Expired GB917974A (en) 1959-02-05 1960-01-28 Process for the production of m- and p-difluorobenzenes

Country Status (4)

Country Link
BE (1) BE586870A (en)
CH (1) CH379478A (en)
DE (1) DE1096889B (en)
GB (1) GB917974A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3950444A (en) * 1973-03-05 1976-04-13 Olin Corporation Process for preparing ortho substituted aryl fluorides
CN112624896A (en) * 2020-12-18 2021-04-09 浙江解氏新材料股份有限公司 Continuous synthesis method of m-difluorobenzene based on microchannel reactor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988007987A1 (en) * 1987-04-06 1988-10-20 Mallinckrodt, Inc. Improved process for preparing aromatic fluorides

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3950444A (en) * 1973-03-05 1976-04-13 Olin Corporation Process for preparing ortho substituted aryl fluorides
CN112624896A (en) * 2020-12-18 2021-04-09 浙江解氏新材料股份有限公司 Continuous synthesis method of m-difluorobenzene based on microchannel reactor

Also Published As

Publication number Publication date
BE586870A (en)
CH379478A (en) 1964-07-15
DE1096889B (en) 1961-01-12

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