- Rhodium(III)-catalyzed regioselective C–H nitrosation/annulation of unsymmetrical azobenzenes to synthesize benzotriazole N-oxides via a RhIII/RhIII redox-neutral pathway
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A Rh(III)-catalyzed regioselective C–H nitrosation/annulation reaction of unsymmetrical azobenzenes with [NO][BF4] has been developed to achieve high-yielding syntheses of benzotriazole N-oxides with excellent functional group tolerance. Computational studies have revealed that this oxidative C–H functionalization reaction involves an interesting redox-neutral Rh(III)/Rh(III) pathway without the change of Rh oxidation state.
- Zhang, Yuanfei,Chen, Zhe-Ning,Su, Weiping
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- Selective and Scalable Electrosynthesis of 2H-2-(Aryl)-benzo[d]-1,2,3-triazoles and Their N-Oxides by Using Leaded Bronze Cathodes
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Electrosynthesis of 2H-2-(aryl)benzo[d]-1,2,3-triazoles and their N-oxides from 2-nitroazobenzene derivatives is reported. The electrolysis is conducted in a very simple undivided cell under constant current conditions with a leaded bronze cathode and a g
- Wirtanen, Tom,Rodrigo, Eduardo,Waldvogel, Siegfried R.
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p. 5592 - 5597
(2020/04/15)
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- Electroluminescent Metal Complexes With Triazoles
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Disclosed are electroluminescent metal complexes with triazoles of the formula (I), where n1 is an integer of 1 to 3, m1 and m2 each are an integer 0, 1 or 2, M1 is a metal with an atomic weight of greater than 40, L1 is a monodentat
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Page/Page column 31
(2009/04/24)
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- Electroluminescent Metal Complexes With Triazoles And Benzotriazoles
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This invention relates to electroluminescent metal complexes with triazoles and benzotriazoles, respectively of the formula (I) a process for their preparation, electronic devices comprising the metal complexes and their use in electronic devices, especia
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Page/Page column 46
(2010/11/29)
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- Vergleichende Untersuchungen zur Arylaminierung von Benzofuroxan-Derivaten
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The amination of benzofuroxan 2a and monosubstituted benzofuroxans 2b-e with alkali metal salts of formanilides 1 and sodium acetanilides 6 is described.Thus, the reaction of 2a with 6a-d gives the benzotriazole 1-oxides 3a-d.The benzofuroxans 2b and 2c react with sodium formanilides to give the isomeric mixtures 3f/3g and 3h/3i.Potassium 4-nitroformanilide reduces 2a furnishing benzofurazan 7.Nitrosubstituted benzofuroxans such as 2d and 2e undergo a carbocyclic amination leading to the benzofurazans 8 and 9.
- Goehrmann, B.,Niclas, H.-J.
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p. 1054 - 1060
(2007/10/02)
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- A NOVEL SYNTHETIC ROUTE TO 2-ARYL-2H-BENZOTRIAZOLE 1-OXIDES
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The reaction of benzofuroxan 1 with sodium or potassium salts of formanilides 2 affords 2-aryl-2H-benzotriazole 1-oxides 3 in moderate to good yields.By heating the reactants in toluene or DMSO formal O/N exchange with elimination of alkali formate takes
- Niclas, H.-J.,Goehrmann, B.
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p. 2141 - 2150
(2007/10/02)
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- The Reaction of Some o-Nitroazobenzenes with Hydroxylamine
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The reaction of some representative o-nitroazobenzenes with hydroxylamine in ethanolic sodium hydroxide solution gave good to excellent yields of the corresponding 2-aryl-2H-benzotriazole 1-oxides.In some cases, the corresponding parent 2-aryl-2H-benzotriazoles were also obtained.Under the same reaction conditions, nitrobenzene was essentially unreactive.It Is suggested that the reactive species is diimide.
- Wilshire, John F.K.
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p. 617 - 622
(2007/10/02)
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- The Reduction of Some o-Nitrophenylazo Dyes with Thiourea S,S-Dioxide (Formamidinesulfinic Acid): a General Synthesis of 2-Aryl-2H-benzotriazoles and Their 1-Oxides
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Thiourea S,S-dioxide (formamidinesulfinic acid) reacts with o-nitrophenylazo dyes in ethanolic alkali to give, depending on the reaction conditions, either the corresponding 2-aryl-2H-benzotriazoles or their 1-oxides.The reagent is particularly effective for preparing in high yield 2-(2'H-benzotriazol-2'-yl)phenols, which are important ultraviolet absorbers.The corresponding reductions involving ammonium sulfide and sodium dithionite were also examined.The former reagent was unsatisfactory; the latter reagent behaved erratically and was a less effective reducing reagent than thiourea dioxide.Nevertheless, conditions were established whereby sodium dithionite furnished the 2-(2'H-benzotriazol-2'-yl)phenols in high yield and purity.
- Rosevear, Judi,Wilshire, John F. K.
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p. 2489 - 2497
(2007/10/02)
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