IUPAC Name: 2-Hydroxynaphthalene-1-carbaldehyde
Following is the structure of 2-Hydroxynaphthaldehyde (CAS NO.708-06-5):
                
Molecular Formula: C₁₁H₈O₂
Formula Weight: 172.18
Sensitive : Air Sensitive
Index of Refraction: 1.719
Molar Refractivity: 52.72 cm³
Molar Volume: 133.6 cm³
Density: 1.288 g/cm³
Solubility in water: 40 mg/l
Flash Point: 134.3 °C
Melting point: 76-80 °C(lit.)
Surface Tension: 59.4 dyne/cm
Enthalpy of Vaporization: 56.81 kJ/mol
Boiling Point: 305.8 °C at 760 mmHg
Vapour Pressure: 0.000443 mmHg at 25 °C
Appearance of 2-Hydroxynaphthaldehyde (CAS NO.708-06-5): yellow-beige-brown Powder
Product Categories: Intermediates of Dyes and Pigments; Aromatic Aldehydes & Derivatives (substituted);Aldehydes; C10 to C21; Carbonyl Compounds
Canonical SMILES: C1=CC=C2C(=C1)C=CC(=C2C=O)O
InChI: InChI=1S/C11H8O2/c12-7-10-9-4-2-1-3-8(9)5-6-11(10)13/h1-7,13H
InChIKey: NTCCNERMXRIPTR-UHFFFAOYSA-N

 2-Hydroxynaphthaldehyde (CAS NO.708-06-5) is used as organic synthesis intermediate, as well as analytical reagent of measuring palladium and beryllium.

2-naphthol reacts with chloroform to get 2-HYDROXYNAPHTHALDEHYDE (708-06-5).

 2-Hydroxynaphthaldehyde (CAS NO.708-06-5) hasn't been listed as a carcinogen by ACGIH, IARC, NTP, or CA Prop 65. And the toxicological properties have not been fully investigated. You can see actual entry in RTECS for complete information.

Reported in EPA TSCA Inventory.

Hazard Codes: Xi,N
Risk Statements: 36/37/38-50/53
R36/37/38:Irritating to eyes, respiratory system and skin.
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 26-36-60-61-24/25-37 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S60:This material and its container must be disposed of as hazardous waste. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S24/25:Avoid contact with skin and eyes. 
S37:Wear suitable gloves.
RIDADR: UN 3077 9/PG 3
WGK Germany: 2
RTECS: QJ0300000
Moderately toxic by intraperitoneal route. When heated to decomposition it emits acrid smoke and irritating vapors.

 2-Hydroxynaphthaldehyde , its cas register number 708-06-5. It also can be called 2-Hydroxy-1-naphthalenecarboxaldehyde ; Formyl-2-naphthol ; 1-Hydroxy-2-naphthalenecarboxaldehyde ; 1-Naphthalenecarboxaldehyde, 2-hydroxy- ; 2-Hydroxy-1-naphthalaldehyde ; 2-Hydroxy-1-naphthaldehyde ; 2-Hydroxy-1-naphthalenecarboxaldehyde ; 2-Hydroxy-1-naphthylaldehyde ; 2-Hydroxy-1-napthaldehyde ; 2-Naphthol 1-carboxaldehyde ; and beta-Hydroxynaphthaldehyde .
 2-Hydroxynaphthaldehyde (CAS NO.708-06-5) is air sensitive and light sensitive. It should avoid the condition like incompatible materials, light, exposure to air. It is not compatible with strong oxidizing agents, strong bases. And also prevent it to broken down into hazardous decomposition products: carbon monoxide, carbon dioxide. However, its hazardous polymerization has not been reported.