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1-Methylnaphthalene

CAS No.90-12-0
Chemical Name:1-Methylnaphthalene
CBNumber:CB4127653
Molecular Formula:C11H10
Formula Weight:142.2
MOL File:90-12-0.mol

1-Methylnaphthalene Property

Melting point −22 °C(lit.)
Boiling point 240-243 °C(lit.)
Density 1.001 g/mL at 25 °C(lit.)
vapor pressure 2 hPa (25 °C)
refractive index n20/D 1.615(lit.)
FEMA 3193 | 1-METHYLNAPHTHALENE
Flash point 180 °F
storage temp. Store below +30°C.
solubility 0.026g/l
pka 37(at 25℃)
form Liquid
color Clear colorless to yellow
Odor at 1.00 % in dipropylene glycol. naphthyl chemical medicinal camphor
Odor Type naphthyl
biological source synthetic
explosive limit 0.7-6.5%(V)
Water Solubility 0.026 g/L (25 ºC)
JECFA Number 1335
BRN 506793
Dielectric constant 2.7（20℃）
Exposure limits ACGIH: TWA 0.5 ppm (Skin)
Stability Stable. Combustible. Incompatible with strong oxidizing agents, oxygen.
InChIKey QPUYECUOLPXSFR-UHFFFAOYSA-N
LogP 3.91
Surface tension 38.6mN/m at 20°C
Substances Added to Food (formerly EAFUS) 1-METHYLNAPHTHALENE
CAS DataBase Reference 90-12-0(CAS DataBase Reference)
FDA UNII E7SK1Y1311
NIST Chemistry Reference Naphthalene, 1-methyl-(90-12-0)
EPA Substance Registry System 1-Methylnaphthalene (90-12-0)
UNSPSC Code 41116107
NACRES NA.24

Safety

Hazard Codes :Xn,N,T
Risk Statements :22-36/37/38-42/43-51/53-39/23/24/25-23/24/25-20/21/22
Safety Statements :7-26-36/37/39-61-45-36/37-23-36
RIDADR :UN 3082 9/PG 3
WGK Germany :2
RTECS :QJ9630000
Autoignition Temperature :984 °F
TSCA :Yes
HazardClass :9
PackingGroup :III
HS Code :29029080
Hazardous Substances Data :90-12-0(Hazardous Substances Data)
Toxicity :LD50 orally in Rabbit: 1840 mg/kg

NFPA 704:

	1
1		0

Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal wordDanger
Hazard statements H302-H304-H411
Precautionary statements P273-P301+P310+P331-P301+P312+P330

1-Methylnaphthalene Price More Price(16)

Brand: Sigma-Aldrich(India)
Product number: W319309
Product name : 1-Methylnaphthalene
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Brand: Sigma-Aldrich(India)
Product number: W319309
Product name : 1-Methylnaphthalene
Purity: ≥95%
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Brand: Sigma-Aldrich(India)
Product number: W319309
Product name : 1-Methylnaphthalene
Purity: ≥95%
Packaging: 1KG
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Brand: Sigma-Aldrich(India)
Product number: W319309
Product name : 1-Methylnaphthalene
Purity: ≥95%
Packaging: 5KG
Price: ₹40236.9
Updated: 2022/06/14
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Brand: Sigma-Aldrich(India)
Product number: M56808
Product name : 1-Methylnaphthalene
Purity: 95%
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1-Methylnaphthalene Chemical Properties,Usage,Production

Description 1-methylnaphthalene is a methylnaphthalene carrying a methyl substituent at position. It is a polycyclic aromatic hydrocarbon (PAH). It is present in cigarette smoke, wood smoke, tar, asphalt, and at some hazardous waste sites. The main use of 1-methylnaphthalene is as a raw material for naphthoic acid, fluorescent whitening agents, and surfactants. It is also used as a raw material for dyestuff dispersants and heat transfer oils, and as a solvent for agricultural chemical.
Chemical Properties 1-methylnaphthalene is a colorless, bluefluorescing liquid with an earthy, phenolic odor. It is insoluble in water but dissolves in alcohol and ether. With a density greater than water, this combustible substance is obtained from coal tar and used in organic synthesis. It has a role as a carcinogenic agent and a plant metabolite.
Occurrence Methylnaphthalene was identified as a volatile component of cassava, roasted filberts and nectarines. Assorted types of lima, pinto, red kidney, black, navy and mung beans, soybeans, split peas and lentils were found to contain 1-methylnaphthalene at concentrations ranging from 2.8 to 49.2 ppb.
Uses The main uses of methylnaphthalene are as a raw material for dyestuff dispersants and heat transfer oils, and as a solvent for agricultural chemical. It is used in insecticide manufacturing; manufacture of phthalic anhydride; solvent in organic synthesis; asphalt and naptha constituent. It is also used as a test substance for the determination of the cetane number of diesel fuels. Further, it is employed in the preparation of 1-methylnaphthalene-d10 using deuterium oxide, sodium deuteroxide.
Definition ChEBI: 1-methylnaphthalene is a methylnaphthalene carrying a methyl substituent at position 1. It has a role as a carcinogenic agent and a plant metabolite.
Preparation 1-Methylnaphthalene is primarily derived from coal tar and petroleum oils. It is present in high-temperature coal tar in a concentration of 0.5% and is produced industrially from the methylnaphthalene fraction, which boils between 240 and 245 °C, by redistillation of the 2-methylnaphthalene filtrate following crystallization and separation of 2-methylnaphthalene.
Aroma threshold values Detection: 7.5 to 20 ppb.
Taste threshold values Taste characteristics at 1 ppm: naphthyl-like with a medicinal nuance.
Synthesis Reference(s) Journal of the American Chemical Society, 65, p. 295, 1943 DOI: 10.1021/ja01242a503
The Journal of Organic Chemistry, 53, p. 4466, 1988 DOI: 10.1021/jo00254a009
Tetrahedron Letters, 29, p. 97, 1988 DOI: 10.1016/0040-4039(88)80026-1
General Description 1-methylnaphthalene is a colorless liquid. Freezing point -22 °C (7.6 °F). Boiling point 240-243 °C (464-469 °F). Flash point 82 °C (180 °F). Denser than water. Derived from coal tar and used in organic synthesis.
Air & Water Reactions Insoluble in water.
Reactivity Profile 1-Methylnaphthalene is sensitive to heat. Reacts with strong oxidizing agents. Incompatible with oxygen and peroxides .
Hazard Moderate fire risk. Lower respiratory tractirritant and lung damage. Questionable carcinogen.
Health Hazard Harmful if inhaled. Liquid causes irritation of the eyes and skin and skin photosensitization. Harmful if swallowed. Chronic exposure may cause liver or kidney damage.
Fire Hazard 1-Methylnaphthalene is combustible.
Carcinogenicity The carcinogenic potential of 1- and 2-methyl was investigated in B6C3F1 mice. Female and male mice were given methylnaphthalene in their diets for 81 weeks. The results indicated that 1-methyl was a possible weak carcinogen in the lung of male but not female mice whereas 2-methyl did not possess unequivocal carcinogenic potential in these mice.
Purification Methods Dry 1-methylnaphthalene for several days with CaCl2 or by prolonged refluxing with BaO. Fractionally distil it through a glass helices-packed column from sodium. Purify it further by solution in MeOH and precipitation of its picrate complex by adding to a saturated solution of picric acid in MeOH. The picrate, after crystallisation to constant melting point (m 140-141o) from MeOH, is dissolved in *benzene and extracted with aqueous 10% LiOH until the extract is colourless. Evaporation of the *benzene solution under vacuum gives 1-methylnaphthalene [Kloetzel & Herzog J Am Chem Soc 72 1991 1950]. However, neither the picrate nor the styphnate complexes satisfactorily separate 1-and 2-methylnaphthalenes. To achieve this, 2-methylnaphthalene (10.7g) in 95% EtOH (50mL) has been precipitated with 1,3,5-trinitrobenzene (7.8g) and this complex has been crystallised from MeOH to m 153-153.5o (m of the 2-methyl isomer is 124o). [Alternatively, 2,4,7-trinitrofluorenone in hot glacial acetic acid could be used, and the derivative (m 163-164o) is recrystallised from glacial acetic acid]. The 1-methylnaphthalene is regenerated by passing a soution of the complex in dry *benzene through a 15-in column of activated alumina and washing with *benzene/pet ether (b 35-60o) until the coloured band of the nitro compound had moved down near the end of the column. The complex can also be decomposed using tin and acetic-hydrochloric acids, followed by extraction with diethyl ether and *benzene; the extracts are washed successively with dilute HCl, strongly alkaline sodium hypophosphite, water, dilute HCl and water. [Soffer & Stewart J Am Chem Soc 74 567 1952.] It can be freed from anthracene by zone melting [Beilstein 5 IV 1687.]
Toxics Screening Level The current ITSL for 1-methylnaphthalene (250 μg/m3) has a justification (attached) dated April 28, 2008. The averaging time (AT) assigned at that time was 24 hours, as per the default methodology (Rule 232(2)(b))