Molecular Formula: C₁₂H₁₃N
Molar mass: 171.24 g/mol
EINECS: 201-682-4
Density: 1.06 g/cm³
Flash Point: 106.7 °C
Index of Refraction: 1.642
Boiling Point: 268.2 °C at 760 mmHg
Vapour Pressure: 0.00778 mmHg at 25°C
Storage temp: Store at RT.
Water solubility: Insoluble
Appearance: Light yellow liquid
Color: brown
Structure of N,N-Dimethyl-1-naphthylamine (86-56-6):
XLogP3-AA: 3.5
H-Bond Donor: 0
H-Bond Acceptor: 1
IUPAC Name: N,N-Dimethylnaphthalen-1-amine
Canonical SMILES: CN(C)C1=CC=CC2=CC=CC=C21
InChI: InChI=1S/C12H13N/c1-13(2)12-9-5-7-10-6-3-4-8-11(10)12/h3-9H,1-2H3 
InChIKey: AJUXDFHPVZQOGF-UHFFFAOYSA-N

Carcinogenicity of N,N-Dimethyl-1-naphthylamine (86-56-6) hasn't been listed as a carcinogen by NTP, IARC,ACGIH, or CA Prop 65. And its toxicological properties have not been fully investigated.You can see actual entry in RTECS for complete information.

Reported in EPA TSCA Inventory.

Poison by intraperitoneal route. Moderately toxic by ingestion. Mutation data reported. When heated to decomposition it emits toxic fumes of NO_x.
 

Hazard Codes: Xn,N
Risk Statements:
22:  Harmful if swallowed 
36:  Irritating to the eyes
37:  Irritating to the respiratory system
38:  Irritating to the skin
51:  Toxic to aquatic organisms
53:  May cause long-term adverse effects in the aquatic environment
Safety Statements:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
29:  Do not empty into drains
36:  Wear suitable protective clothing 
37:  Wear suitable gloves
39:  Wear eye/face protection
61:  Avoid release to the environment. Refer to special instructions safety data sheet

 N,N-Dimethyl-1-naphthylamine (86-56-6) also can be called 1-Dimethylaminonaphthalene ; N,N-dimethylnaphthalen-1-amine ; .alpha.-Dimethylaminonaphthalene ; 1-Naphthalenamine, N,N-dimethyl- ; 1-Naphthylamine, N,N-dimethyl- .It is hazardous,so the first aid measures and others should be known.Such as: When on the skin: first,should  flush skin with plenty of water immediatelyfor at least 15 minutes while removing contaminated clothing. Secondly,Get shoesmedical aid . Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids.Then get medical aid soon.While ,it's Inhaled: Remove from exposure and move to fresh air immediately.Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Wash mouth out with water,and get medical aid immediately.Notes to physician: Treat supportively and symptomatically.
In addition, N,N-Dimethyl-1-naphthylamine (86-56-6) is moisture sensitive with air,and can be stable under normal temperature and pressure conditions.It is not compatible with strong oxidizing agents, and you must not take it with incompatible materials, and not be exposured to moist air or water. And also prevent it to broken down into hazardous decomposition products: oxides of nitrogen, carbon dioxide, carbon monoxide, nitrogen.