Nomenclature
CAS number: 521-24-4
3,4-Dihydro-3,4-dioxo-1-naphthalenesulfonic acid sodium salt; sodium 1,2-naphthoquinone-4-sulfonate; 1,2-naphthoquinone-4-sulfonic acid sodium salt; β-naphthoquinone-4-sulfonic acid sodium salt.
C
10H
5NaO
5S; mol wt 260.20.
C 46.16%, H 1.94%, Na 8.84%, O 30.74%, S 12.32%.
Description and references
Prepn: Folin, J. Biol.
Chem. 51, 377 (1922).
Properties
Yellow crystals from dil alc. Readily sol in
water; slightly sol in 95% alcohol; moderately sol in acetone; practically
insol in ether, chloroform, carbon disulfide, benzene, petr ether.
Aq solns fade slowly on exposure to light but may be stabilized by
HCl.Use
Colorimetric determn of amino acids and amines.