2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene Property

Melting point:

199-201 °C(lit.)

Boiling point:

531.2±45.0 °C(Predicted)

Density 

1.26

refractive index 

1.6360 (estimate)

Flash point:

>350°C

storage temp. 

Keep in dark place,Sealed in dry,Room Temperature

solubility 

toluene: soluble50mg/mL

form 

powder

pka

3.03±0.10(Predicted)

color 

Pale Green to Yellow

Water Solubility 

Soluble in acetone and toluene. Insoluble in water.

λmax

373nm(EtOH)(lit.)

Merck 

14,1014

BRN 

631803

Stability:

Stable. Incompatible with strong oxidizing agents.

InChIKey

AIXZBGVLNVRQSS-UHFFFAOYSA-N

LogP

8.6 at 25℃

CAS DataBase Reference

7128-64-5(CAS DataBase Reference)

NIST Chemistry Reference

Benzoxazole, 2,2'-(2,5-thiophenediyl)bis[5-(1,1-dimethylethyl)-(7128-64-5)

EPA Substance Registry System

2,2'-(2,5-Thiophenediyl)bis[5-tert-butylbenzoxazole] (7128-64-5)

Safety

Risk Statements 

36/37/38

Safety Statements 

24/25

WGK Germany 

1

RTECS 

DM4888332

TSCA 

Yes

HS Code 

29349990

Toxicity

LD50 orl-rat: >10 g/kg MVCRB3 2,193,1973

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

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

P271Use only outdoors or in a well-ventilated area.

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

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene Chemical Properties,Usage,Production

Description

2,5-Bis (5-tert-butyl-2-benzoxazolyl) thiophene (also known as fluorescent brightener 184)¹ is used as an optical brightener, which converts UV light into visible light. It is also used as a fluorescent brightener for thermoplastic resins of polyvinyl chloride, acrylic resin, polyester fiber, thermoplastic plastic, ABS, cellulose acetate fiber, paint, coating and printing ink. It is also useful in detecting the presence of thin-film electrical contact lubricants^2-4.

Sources

1. https://pubchem.ncbi.nlm.nih.gov/compound/bbot#section=Top
2. https://www.alfa.com/zh-cn/catalog/A14928/
3. http://www.xcolorpigment.com/FLUORESCENT-BRIGHTENER-OB.html
4. http://www.offerchems.com/products/catalyst-auxiliary/fluorescent-brightener-184-cas-7128-64-5/

Chemical Properties

light yellow-green crystals

Uses

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene is used as an optical brightener which converts UV light into visible light. It is also used as a fluorescent brightener for thermoplastic resins of polyvinyl chloride, acrylic resin, polyester fiber, paint, coating and printing ink. It is also useful in detecting the presence of thin-film electrical contact lubricants.

Uses

Optical brightener additive in polymers, fibers, films, inks, laquers, and paints. In liquid scintillators.

Flammability and Explosibility

Not classified

Safety Profile

Low toxicity by ingestion. Whenheated to decomposition it emits toxic vapors of NOx andSOx.

Synthesis

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene, also known as fluorescent brightener 0B, is used as a mixing raw material for plastics, coatings, road marking paints, etc., to achieve a whitening effect. In the prior art, the preparation method is to add a mixed solution of trichlorobenzene and toluene into a reaction kettle, then add 0B acid (i.e. thiophene 2,5-dicarboxylic acid), 0B phenol (i.e. p-tert-butyl-o-aminophenol) and boric acid, heat to about 120°C for condensation reaction, evaporate the water generated by the reaction together with the toluene, release the water with a water separator, and return the toluene to the reaction kettle. When the temperature of the reaction material rises to above 180°C, the toluene is evaporated, and the temperature continues to rise for reaction. The water is continuously separated by utilizing the immiscibility of trichlorobenzene and water until the reaction temperature reaches about 230°C. Based on the dehydration phenomenon, the reaction is judged to be complete, and then the material is cooled to below 30°C. The product is crystallized in trichlorobenzene, solid-liquid separation is performed, the trichlorobenzene mother liquor is used for recovery, and the obtained solid material is refined with xylene to obtain 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene.

Properties and Applications