74141-86-9

Basic information

• Product Name: (4-methoxy-[1]naphthyl)-o-tolyl-diazene
• CAS NO: 74141-86-9
• Molecular Weight: 276.338
• Mol File: 74141-86-9.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: (4-methoxy-[1]naphthyl)-o-tolyl-diazene(CAS DataBase Reference)
• NIST Chemistry Reference: (4-methoxy-[1]naphthyl)-o-tolyl-diazene(74141-86-9)
• EPA Substance Registry System: (4-methoxy-[1]naphthyl)-o-tolyl-diazene(74141-86-9)

Safety Data

• Hazardous Substances Data: 74141-86-9(Hazardous Substances Data)

Upstream product

• 130-15-4 [1,4]naphthoquinone 
• 90-15-3 α-naphthol 
• 5098-94-2 1-o-tolylazo-4-naphthol 

Relevant articles and documents

Protonation Equilibria of 1-Arylazo-4-naphthols and 1-Arylazo-4-Methoxynaphthalenes

The spectroscopic behaviour of substituted 1-arylazo-4-naphthols and 1-arylazo-4-methoxynaphthalenes has been investigated in a solvent system consisting of 20percent v/v ethanol and 80percent v/v sulphuric acid-water in order to measure the protonation equilibrium constants.Some naphthols (I; X=H, o-OCH3, p-OCH3, o-CH3, p-Cl) and all the methoxynaphthalenes (II) show two absorption bands due to the free base and the conjugate acid, with a characteristic isosbestic point.For these compounds, pKBH(1+) values have been calculated using Jaffe's acidity function.Other naphthols (I; X=m-OCH3, m-CH3, p-CH3, o-Cl, m-Cl) show a single absorption band which shifts on changing the acidity of the medium.The lack of an isosbestic point has been ascribed to the overlap of the azo-hydrazone equilibrium with the protonation equilibrium of the azo-group.For methoxynaphthalenes, separate correlations of pKBH(1+) values with ?m and ?p of the substituents are found, owing to the presence in the molecules of two distinct basic centres.