We are offering 1-Nitroso-2-naphthol. Cas no : 131-91-9 properties: yellowish-brown needles from petr ether, mp 109-110°. Sol in 1000 parts water, 35 parts alcohol; also sol in hot alcohol, benzene, ether, carbon disulfide, caustic alkali solns, glacial acetic acid; slightly sol in cold petr ether. Cas name: 1-nitroso-2-naphthalenol additional names: nitroso-b-naphthol molecular formula: c10h7no2 molecular weight: 173.17 percent composition: c 69.36%, h 4.07%, n 8.09%, o 18.48% melting point : 104-108 ºc water solubility : insuluble use: to prevent gum formation in gasoline; in analytical chemistry in the determination of cobalt (to separate it from nickel).