5690-27-7

Basic information

• Product Name: 1,4,5,8-Naphthalenetetrol
• Synonyms: 1,4,5,8-Naphthalenetetrol;Leuconaphthazarin
• CAS NO: 5690-27-7
• Molecular Formula: C₁₀H₈O₄
• Molecular Weight: 192.17
• Mol File: 5690-27-7.mol
• Article Data: 2

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 1,4,5,8-Naphthalenetetrol(CAS DataBase Reference)
• NIST Chemistry Reference: 1,4,5,8-Naphthalenetetrol(5690-27-7)
• EPA Substance Registry System: 1,4,5,8-Naphthalenetetrol(5690-27-7)

Safety Data

• Hazardous Substances Data: 5690-27-7(Hazardous Substances Data)

Upstream product

• 85213-82-7 naphthazarin semiquinone 

Downstream Products

• 475-38-7 5,8-Dihydroxy-1,4-naphthoquinone 
• 6047-49-0 1,4,5,8-Tetraacetoxy-naphthalin 
• 84165-87-7 7,10-Dihydroxy-1,3,5,12-tetraphenyl-2-thia-cyclopenta[b]naphthacene-6,11-dione 
• 88051-28-9 naphtho[1,8-de:4,5-d'e']bis([1,3]dioxine) 

Relevant articles and documents

Thermodynamics of semiquinone disproportionation in aqueous buffer

The thermodynamic parameters, Kdisp, ΔH° and ΔS°, controlling the disproportionation of semiquinones derived from 1,4-benzoquinone (BQ), 1,4-naphthoquinone (NQ), 2-methylbenzoquinone (MBQ), menadione (MNQ), naphthazarin (NZQ) and quinizarin (QNZ), have been determined. Smaller disproportionation constants, Kdisp, are observed upon addition of a fused benzene ring to the semiquinone structure. Negative enthalpies and positive entropies of disproportionation govern the disproportionation equilibria. Addition of OH groups to the 5 and 8 positions in NQ?- displaces the disproportionation equilibrium to the semiquinone probably due to intramolecular hydrogen bonding.