ChemicalBook CAS DataBase List 2-[(2-Nitrophenyl)azo]-4-(1,1,3,3-tetramethylbutyl)phenol

2-[(2-Nitrophenyl)azo]-4-(1,1,3,3-tetramethylbutyl)phenol synthesis

4synthesis methods

Product Name:2-[(2-Nitrophenyl)azo]-4-(1,1,3,3-tetramethylbutyl)phenol
CAS Number:51656-57-6
Molecular formula:C20H25N3O3
Molecular Weight:355.43

Benzenediazonium, 2-nitro-, chloride (1:1)

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140-66-9 Synthesis

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2-[(2-Nitrophenyl)azo]-4-(1,1,3,3-tetramethylbutyl)phenol

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Yield:51656-57-6 94%

Reaction Conditions:

with sodium hydroxide in ethanol;water at 10; pH=7.2-7.8; for 3 h;

Steps:

1.3; 2.3; 3.3 Step 3. Preparation of 2-nitro-2'-hydroxy-5'-tert-octylazobenzene:

1 mol of 4-tert-octylphenol, 1500ml of ethanol is added to the coupling reactor, stir and dissolve, and cool to below 10 °C. Adjust the pH to a weak alkaline with a 15% aqueous sodium hydroxide solution (optimum pH 7.2-7.8). Temperature-controlled dropwise addition of 2-nitrodiazophenyl hydrochloride solution, the reaction was carried out for 3 hours, suction filtration, and the filter cake was washed with a small amount of ethanol. Drying gave 2-nitro-2'-hydroxy-5'-tert-octylazobenzene with a yield of ≥94% and a purity of ≥98%.

References:

CN110066252,2019,A Location in patent:Paragraph 0032; 0036; 0039; 0043; 0046; 0050

88-74-4 Synthesis