GB809350A - Process for diazotising aromatic amines - Google Patents

Process for diazotising aromatic amines

Info

Publication number
GB809350A
GB809350A GB783257A GB783257A GB809350A GB 809350 A GB809350 A GB 809350A GB 783257 A GB783257 A GB 783257A GB 783257 A GB783257 A GB 783257A GB 809350 A GB809350 A GB 809350A
Authority
GB
United Kingdom
Prior art keywords
diazotized
nitro
water
acid
aminobenzene
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
GB783257A
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of GB809350A publication Critical patent/GB809350A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C245/00—Compounds containing chains of at least two nitrogen atoms with at least one nitrogen-to-nitrogen multiple bond
    • C07C245/20—Diazonium compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B41/00—Special methods of performing the coupling reaction

Landscapes

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

Abstract

Aromatic primary amines which are slightly soluble in water and whose salts are readily hydrolysed by water are diazotized by treating the amine when it has a particle size of less than 30 microns with nitrous acid at a pH between 1.5 and 5. The amines may be mixed with a dispersing, wetting or emulsifying agent and are dried and ground to a particle size of preferably below 10 microns. The powder is then suspended in water and diazotized at room temperature or slightly above, e.g. with a mixture of acetic acid and sodium nitrite. The dispersing, wetting and emulsifying agents mentioned are a condensate of formaldehyde and naphthalene sulphonic acid, alkyl-naphthalene sulphonates, olein-polyglycol ether, diglycol, dextrin and abietic acid polyglycol ether and one or more of these is used in the following examples: (i) 21-nitro - 2:4 - dimethyl - 5 - methoxy - 4 aminoazobenzene is diazotized at pH 3.0-3.5; (ii), (vi), (vii) 41-nitro-2:5-dimethoxy-4-aminobenzene is diazotized at pH 2.9-3.5; (iii) 2-aminodiphenyl sulphone is diazotized at pH 1.7-2.2; (iv) 2-nitro-1-aminobenzene is diazotized at pH 2.9; (v) 1-amino-anthraquinone is diazotized at pH 1.8.
GB783257A 1956-03-09 1957-03-08 Process for diazotising aromatic amines Expired GB809350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF19749A DE1023771B (en) 1956-03-09 1956-03-09 Process for the diazotization of aromatic amines which are sparingly soluble in water, the salts of which are easily hydrolyzed in water

Publications (1)

Publication Number Publication Date
GB809350A true GB809350A (en) 1959-02-25

Family

ID=7089429

Family Applications (1)

Application Number Title Priority Date Filing Date
GB783257A Expired GB809350A (en) 1956-03-09 1957-03-08 Process for diazotising aromatic amines

Country Status (5)

Country Link
BE (1) BE555654A (en)
CH (1) CH356779A (en)
DE (1) DE1023771B (en)
FR (1) FR1169206A (en)
GB (1) GB809350A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4754020A (en) * 1985-03-30 1988-06-28 Bayer Aktiengesellschaft Process for preparing aromatic diazonium salts by diazotation of amines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2910199A1 (en) * 1979-03-15 1980-09-25 Hoechst Ag METHOD FOR PRODUCING DIAZONIUM SALT SOLUTIONS

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH165829A (en) * 1933-03-09 1933-12-15 Chem Ind Basel Diazotization process.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4754020A (en) * 1985-03-30 1988-06-28 Bayer Aktiengesellschaft Process for preparing aromatic diazonium salts by diazotation of amines

Also Published As

Publication number Publication date
DE1023771B (en) 1958-02-06
CH356779A (en) 1961-09-15
BE555654A (en)
FR1169206A (en) 1958-12-24

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