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

Synonym(s):BBOT

CAS NO.：7128-64-5
Empirical Formula: C26H26N2O2S
Molecular Weight: 430.56
MDL number: MFCD00005774
EINECS: 230-426-4
SAFETY DATA SHEET (SDS)
Update Date: 2026-06-24 18:39:39

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

What is 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene?

Chemical properties

light yellow-green crystals

The Uses of 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

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

The Uses of 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

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.

Flammability and Explosibility

Not classified

Safety Profile

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

Properties and Applications

TEST ITEMS	SPECIFICATION
APPEARANCE	LIGHT YELLOW OR MILK WHITE POWDER
SHADE	LIGHT YELLOWISH
METLING POINT	201-202 ° C
PURITY	99% min
FINENESS	300 mesh min
SOLUBILITY	hardly soluble in water,but soluble in paraffin, mineral oils and ordinary organic solvents.

Properties of 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

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.
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 information for 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection.