ES447874A1 - Process for the production of 2-aryl-2h-benzotriazoles - Google Patents

Process for the production of 2-aryl-2h-benzotriazoles

Info

Publication number
ES447874A1
ES447874A1 ES447874A ES447874A ES447874A1 ES 447874 A1 ES447874 A1 ES 447874A1 ES 447874 A ES447874 A ES 447874A ES 447874 A ES447874 A ES 447874A ES 447874 A1 ES447874 A1 ES 447874A1
Authority
ES
Spain
Prior art keywords
benzotriazoles
aryl
production
nitroazobenzene
cyclising
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
ES447874A
Other languages
Spanish (es)
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.)
Novartis AG
Original Assignee
Ciba Geigy 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 Ciba Geigy AG filed Critical Ciba Geigy AG
Publication of ES447874A1 publication Critical patent/ES447874A1/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
    • C07D249/16—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms condensed with carbocyclic rings or ring systems
    • C07D249/18—Benzotriazoles
    • C07D249/20—Benzotriazoles with aryl radicals directly attached in position 2

Landscapes

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

Abstract

2-Aryl-2H-benzotriazoles of the formula I < IMAGE > are prepared by reducing a suitable o-nitroazobenzene with hydrogen in the form of a mixture in an aqueous alkaline/organic medium at pH greater than 10 in the presence of a noble-metal hydrogenation catalyst, or an oxide, of Group VIII of the Periodic Table at 20 to 100 DEG C thereof at a pressure of 1 to 66 atmospheres, and cyclising the product. The meanings of the symbols are given in Claim 1. The compounds can be used as UV stabilisers. The process is environmentally friendly and gives high yields.
ES447874A 1975-05-14 1976-05-13 Process for the production of 2-aryl-2h-benzotriazoles Expired ES447874A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US57738475A 1975-05-14 1975-05-14

Publications (1)

Publication Number Publication Date
ES447874A1 true ES447874A1 (en) 1977-07-16

Family

ID=24308475

Family Applications (1)

Application Number Title Priority Date Filing Date
ES447874A Expired ES447874A1 (en) 1975-05-14 1976-05-13 Process for the production of 2-aryl-2h-benzotriazoles

Country Status (9)

Country Link
JP (1) JPS6036430B2 (en)
BE (1) BE841769A (en)
BR (1) BR7603024A (en)
CH (1) CH615166A5 (en)
DE (1) DE2620897A1 (en)
ES (1) ES447874A1 (en)
FR (1) FR2311011A1 (en)
GB (1) GB1494824A (en)
NL (1) NL7605203A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471862A (en) * 1987-09-11 1989-03-16 Chemipro Kasei Kaisha Ltd Production of 2-phenylbenzotriazole
ES2062096T3 (en) * 1988-09-28 1994-12-16 Ciba Geigy Ag PROCEDURE FOR THE OBTAINING OF BENZOTRIAZOLE DERIVATIVES.
JPH02202880A (en) * 1989-01-31 1990-08-10 Kemipuro Kasei Kk Production of 2-phenylbenzotriazoles
JPH02202879A (en) * 1989-01-31 1990-08-10 Kemipuro Kasei Kk Production of 2-phenylbenzotriazoles
EP0419412B1 (en) * 1989-09-20 1993-11-10 Ciba-Geigy Ag Process for the preparation of benzotriazoles
CN112538055A (en) * 2020-12-11 2021-03-23 西安凯立新材料股份有限公司 Preparation method of benzotriazole ultraviolet absorbent

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH529815A (en) * 1970-06-19 1972-10-31 Ciba Geigy Ag Use of 2- (2'-hydroxyphenyl) -benzotriazole compounds as light stabilizers
US3978074A (en) * 1973-11-21 1976-08-31 Uniroyal Inc. Method of making hydroxyarylbenzotriazoles and their N-oxides

Also Published As

Publication number Publication date
NL7605203A (en) 1976-11-16
FR2311011B1 (en) 1978-05-19
DE2620897A1 (en) 1976-11-25
CH615166A5 (en) 1980-01-15
JPS51138677A (en) 1976-11-30
FR2311011A1 (en) 1976-12-10
JPS6036430B2 (en) 1985-08-20
GB1494824A (en) 1977-12-14
BR7603024A (en) 1977-05-31
BE841769A (en) 1976-11-16

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