Pharmaceutical Materials

CAS Number: 81-84-5

Molecular Formula: C12H6O3

Molecular Weight: 198.17 g/mol

Appearance: Light yellow or beige powder Melting Point: 269 °C Boiling Point: 407.5 °C Usage: Used as an important raw material for synthesizing dyes, pigments, and fluorescent brighteners.

Names and Identifiers

Name	1,8-Naphthalic anhydride
Synonyms	ai3-09071 naphthalic Naphthalic anh 1,8-Naphthalic anhydride 1,8 Naphthaloic Anhydride Two1,8-naphthaleneanhydride Benzo[de]isochromene-1,3-dione naphthalenedicarboxylicanhydride Naphthalenedicarboxylic-1,8-anhydride
CAS	81-84-5
EINECS	201-380-2
InChI	InChI=1/C24H14O7/c25-21(26)15-9-1-5-13-7-3-11-17(19(13)15)23(29)31-24(30)18-12-4-8-14-6-2-10-16(20(14)18)22(27)28/h1-12H,(H,25,26)(H,27,28)

​Physico-chemical Properties

Molecular Formula	C12H6O3
Molar Mass	198.17
Density	1.2571 (rough estimate)
Melting Point	269 °C
Boling Point	295.48°C (rough estimate)
Flash Point	272 °C
Water Solubility	decomposes
Solubility	Chloroform (Slightly, Heated), DMSO
Vapor Presure	0Pa at 25℃
Appearance	Powder
Color	Beige to light brown
BRN	153190
Storage Condition	Store below +30°C.
Sensitive	Moisture Sensitive
Refractive Index	1.5550 (estimate)
Physical and Chemical Properties	Characteristics of precipitation of needle-like crystals in ethanol, diamond-like crystals in acetic acid. melting point 267~269 ℃ solubility: insoluble in water, ether, benzene, slightly soluble in hot ethanol, soluble in hot acetic acid.
Use	Is an important raw material for the synthesis of perylene dyes, pigments and fluorescent whitening agents

Risk and Safety

Hazard Symbols	Xi – Irritant
Risk Codes	36/37/38 – Irritating to eyes, respiratory system and skin.
Safety Description	S26 – In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 – Wear suitable gloves and eye/face protection S24/25 – Avoid contact with skin and eyes.
WGK Germany	2
RTECS	QK5350000
FLUKA BRAND F CODES	21
TSCA	Yes
HS Code	29173980

Reference Information

LogP	3.24
surface tension	72.5mN/m at 1.3mg/L and 20 ℃
NIST chemical information	information provided by: webbook.nist.gov (external link)
EPA chemical substance information	information provided by: ofmpeb.epa.gov (external link)
Application	is an important raw material for the synthesis of perylene dyes, pigments and fluorescent whitening agents used as dyes, pesticides, intermediates for pharmaceuticals and polyester resins. as an important raw material for the synthesis of perylene dyes, pigments and fluorescent brighteners
production method	the industrial process uses primary air vaporization, mixed with secondary air, and cobalt as catalyst, after oxidation to 1,8-naphthalene dicarboxylic anhydride, and then cooled to get. Raw material consumption quota: industrial scale: 143-1500kg/t.
category	relatively flammable solid
toxicity grade	low toxicity
Acute toxicity	oral-rat LD50: 12340 mg/kg
flammability hazard characteristics	in case of open flame, high temperature, flammable oxidant
storage and transportation characteristics	The warehouse is ventilated and dried at low temperature; It is stored separately from the oxidant
extinguishing agent	water, dry sand, carbon dioxide, foam, 1211 extinguishing agent
Occupational Standard	PEL 2 mg/m3

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