Reference

a-Naphthalenesulfonic acid

a-Naphthalenesulfonic acid. No, B. I.; Bulankin, R. P.; Yukhno, Yu. M.; Mednikov, E. V.; Ufimtsev, S. V. (Volgograd Polytechnic Institute; All-Union Scientific-Research Institute of Chemicals for Plant Protection, USSR). U.S.S.R. SU 1320206 A1 30 Jun 1987 From: Otkrytiya, Izobret. 1987, (24), 93. (Union of Soviet Socialist Republics) CODEN: URXXAF. CLASS: ICM: C07C143-30. ICA: A01N041-04. APPLICATION: SU 85-3876588 2 Apr 1985. DOCUMENT TYPE: Patent CA Section: 25 (Benzene, Its Derivatives, and Condensed Benzenoid Compounds) 2-Naphthalenesulfonic acid (I) is prepd. by sulfonation of naphthalene with conc. H2SO4 in the presence of Ac2O in equimolar amts. at 35-50°. The purity of I is increased by sulfonating in MeNO2 at a mol ratio of naphthalene MeNO2 1:(2-5).

Aminonaphthalenesulfonic acids

Aminonaphthalenesulfonic acids.Chemical with cas number 18425-74-6 also plays role. Weiskat, Werner; Somlo, Tibor; Halfter, Georg; Portmann, Robert (Ciba-Geigy A.-G., Switz.). Ger. Offen. DE 2703569 4 Aug 1977, 17 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07C143-60. PRIORITY: CH 76-1174 30 Jan 1976. DOCUMENT TYPE: Patent CA Section: 26 (Condensed Aromatic Compounds) The title compds. were prepd. by nitrating naphthalenesulfonic acids in the absence of solvent and reducing the resulting nitro compds. Thus, 1-naphthalenesulfonic acid was nitrated with HNO3 in the presence of urea to give a nitrated mass, which was neutralized with NH3 and hydrogenated over Pd/C to give 5- and 8-amino-1-naphthalenesulfonic acids. 2-Naphthalenesulfonic acid was converted to 5- and 8-amino-2-naphthalenesulfonic acids. .