1-BROMO-2-METHYLNAPHTHALENE

1-BROMO-2-METHYLNAPHTHALENE Property

Boiling point:

296 °C (lit.)

Density 

1.418 g/mL at 25 °C (lit.)

refractive index 

n20/D 1.648(lit.)

Flash point:

>230 °F

storage temp. 

Inert atmosphere,Room Temperature

form 

Liquid

color 

Clear yellow

Water Solubility 

Not miscible in water.

BRN 

2042531

InChI

InChI=1S/C11H9Br/c1-8-6-7-9-4-2-3-5-10(9)11(8)12/h2-7H,1H3

InChIKey

CMIMBQIBIZZZHQ-UHFFFAOYSA-N

SMILES

C1(Br)=C2C(C=CC=C2)=CC=C1C

CAS DataBase Reference

2586-62-1(CAS DataBase Reference)

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38-11

Safety Statements 

26-36-24/25

WGK Germany 

3

HS Code 

29039990

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

1-BROMO-2-METHYLNAPHTHALENE Chemical Properties,Usage,Production

Chemical Properties

CLEAR YELLOW LIQUID

Uses

1-Bromo-2-methylnaphthalene is used as test compound in determination of halogenated hydrocarbons at trace levels by supercritical fluid chromatography-microwave-induced plasma mass spectrometry. Dynamic phosphorescence quenching of 1-bromo-2-methylnaphthalene without deoxygenation has been used for selective sensing of Cu(II) at ngm levels.

Uses

1-Bromo-2-methylnaphthalene was used as test compound in determination of halogenated hydrocarbons at trace levels by supercritical fluid chromatography-microwave-induced plasma mass spectrometry.

General Description

Dynamic phosphorescence quenching of 1-bromo-2-methylnaphthalene without deoxygenation has been used for selective sensing of Cu(II) at ngml^-1 levels. It undergoes asymmetric cross-coupling reaction with its corresponding Grignard reagent using a nickel catalyst to form non-racemic 2,2′-dimethyl-1,1′-binaphthyl.

Synthesis

General procedure for the synthesis of 1-bromo-2-methylnaphthalene from 2-methylnaphthalene: 1. To a stirred mixed solution of carbon tetrachloride (20 mL) and cyclopentene (2.94 g, 43.1 mmol) was added sequentially N-bromosuccinimide (8.06 g, 45.3 mmol) and a catalytic amount of benzoyl peroxide under argon protection. The reaction mixture was heated and stirred at reflux for 1 hour. Upon completion of the reaction, the resulting solid was removed by filtration. The filtrate was concentrated in vacuum to give 3-bromocyclopentene, which was used in the next step of the reaction without further purification. 2. To a stirred suspension of sodium hydride (60% dispersed in mineral oil, 2.60 g, 65.0 mmol) in tetrahydrofuran (10 mL) was slowly added a solution of malononitrile (5.70 g, 86.2 mmol) in tetrahydrofuran (5 mL) at 0 °C and under argon atmosphere. The suspension was stirred at room temperature for 1 hour. Subsequently, a tetrahydrofuran (5 mL) solution of 3-bromocyclopentene was slowly added at 0 °C and stirring was continued at room temperature for 2 hours. After completion of the reaction, ether and saturated saline were added, the organic layer was separated, dried over anhydrous sodium sulfate, filtered and concentrated in vacuum. The residue was purified by silica gel column chromatography (eluent: hexane-ethyl acetate) to afford 3-(dicyanomethyl)cyclopentene (0.889 g, 6.73 mmol, 16% yield). 3. To a stirred solution of carbon tetrachloride (60 mL) containing 2-methylnaphthalene (20.1 g, 141 mmol), a catalytic amount of iron powder and iodine was slowly added a solution of carbon tetrachloride (10 mL) with bromine (22.5 g, 7.2 mL, 141 mmol) at 0 °C. The reaction mixture was stirred for 3 hours. Upon completion of the reaction, the reaction was quenched by the addition of saturated aqueous sodium thiosulfate solution. The organic layer was washed with saturated saline, dried over anhydrous sodium sulfate, filtered and concentrated in vacuum. The residue was purified by silica gel column chromatography (eluent: hexane) to afford 1-bromo-2-methylnaphthalene (29.3 g, 133 mmol, 94% yield). The product was brown liquid; 1H NMR (300 MHz, CDCl3) δ 2.58 (s, 3H), 7.26-8.24 (m, 6H) ppm.

References

[1] Bulletin of the Chemical Society of Japan, 1989, vol. 62, # 2, p. 439 - 443
[2] Journal of Heterocyclic Chemistry, 2018, vol. 55, # 3, p. 670 - 684
[3] Angewandte Chemie - International Edition, 2018, vol. 57, # 39, p. 12869 - 12873
[4] Angew. Chem., 2018, vol. 130, p. 13051 - 13055,5
[5] Tetrahedron, 2009, vol. 65, # 22, p. 4429 - 4439