IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 8 ,1975,p. 225.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . NTP Carcinogenesis Bioassay (feed); Clear Evidence: rat NTPTR*    National Toxicology Program Technical Report Series. (Research Triangle Park, NC 27709) No. NTP-TR-226 ,1982. . Community Right-To-Know List. Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

The IUPAC name of SudanI is (1Z)-1-(phenylhydrazinylidene)naphthalen-2-one. With the CAS registry number 842-07-9, it is also named as C.I. Solvent Yellow 14; 2-Hydroxy-1-phenylazonaphthalene. The product's categories are dyes and pigments; organics; solvent dyestuff. It is orange-red powder which is insoluble in water, slightly soluble in ethanol, easily soluble in oil and mineral oil, and soluble in acetone and benzene. This chemical is an azo compound. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. SudanI is incompatible with strong oxidizing agents and strong acids.

The other characteristics of this product can be summarized as: (1)ACD/LogP: 4.38; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 4; (4)ACD/LogD (pH 7.4): 4; (5)ACD/BCF (pH 5.5): 975; (6)ACD/BCF (pH 7.4): 975; (7)ACD/KOC (pH 5.5): 4798; (8)ACD/KOC (pH 7.4): 4798; (9)#H bond acceptors: 3; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 3; (12)Index of Refraction: 1.634; (13)Molar Refractivity: 75.596 cm³; (14)Molar Volume: 211.353 cm³; (15)Polarizability: 29.969×10^-24 cm³; (16)Surface Tension: 46.836 dyne/cm; (17)Enthalpy of Vaporization: 72.834 kJ/mol; (18)Vapour Pressure: 0 mmHg at 25°C; (19)Rotatable Bond Count: 2; (20)Tautomer Count: 4; (21)Exact Mass: 248.094963; (22)MonoIsotopic Mass: 248.094963; (23)Topological Polar Surface Area: 41.5; (24)Heavy Atom Count: 19.

Preparation of SudanI: It can be obtained by naphthalen-2-ol and N-nitroso-N,N'-diphenyl-urea with reagent 1 N sodium hydroxide and solvent ethanol at ambient temperature. The reaction time is 5 min. The yield is 58 % Spectr.

Uses of SudanI: It is not only used for coloring shoe polish, floor wax, grease, etc., but also for the manufacture of fireworks and lacquer. And it is also used as a biological stain and oil stain. In addition, it can react with 2-(2-bromo-ethoxy)-tetrahydro-pyran to get phenyl-{2-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-naphthalen-1-yl}-diazene. This reaction which is etherification needs reagent potassium carbonate and solvent dimethylformamide at temperature of 80°C. The reaction time is 12 hours. The yield is 99.5%.

When you are using this chemical, please be cautious about it as the following:
It may cause sensitization by skin contact and may cause long-term adverse effects in the aquatic environment, so people should not breathe dust. If you want to contact this product, you must wear suitable protective clothing and gloves. If swallowed, seek medical advice immediately and show this container or label. Avoid release to the environment. Refer to special instructions / safety data sheets.

People can use the following data to convert to the molecule structure. 
1. SMILES: Oc3ccc1ccccc1c3/N=N/c2ccccc2;
2. InChI: InChI=1/C16H12N2O/c19-15-11-10-12-6-4-5-9-14(12)16(15)18-17-13-7-2-1-3-8-13/h1-11,19H/b18-17+.