2,5-Thiophendiylbis(5-tert-butyl-1,3-benzoxazol)

Bezeichnung:2,5-Thiophendiylbis(5-tert-butyl-1,3-benzoxazol)

CAS-Nr7128-64-5

Englisch Name:2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

CBNumberCB3434574

SummenformelC26H26N2O2S

Molgewicht430.56

MOL-Datei7128-64-5.mol

Synonyma

2,5-Thiophendiylbis(5-tert-butyl-1,3-benzoxazol)

2,5-Thiophendiylbis(5-tert-butyl-1,3-benzoxazol) physikalisch-chemischer Eigenschaften

Schmelzpunkt	199-201 °C(lit.)
Siedepunkt	531.2±45.0 °C(Predicted)
Dichte	1.26
Brechungsindex	1.6360 (estimate)
Flammpunkt	>350°C
storage temp.	Keep in dark place,Sealed in dry,Room Temperature
Löslichkeit	toluene: soluble50mg/mL
pka	3.03±0.10(Predicted)
Aggregatzustand	powder
Farbe	Pale Green to Yellow
Wasserlöslichkeit	Soluble in acetone and toluene. Insoluble in water.
maximale Wellenlänge (λmax)	373nm(EtOH)(lit.)
ε(Extinktionskoeffizient)	≥47000 at 372-374nm in dioxane
Merck	14,1014
BRN	631803
Stabilität	Stable. Incompatible with strong oxidizing agents.
InChIKey	AIXZBGVLNVRQSS-UHFFFAOYSA-N
LogP	8.6 at 25℃
CAS Datenbank	7128-64-5(CAS DataBase Reference)
NIST chemische Informationen	Benzoxazole, 2,2'-(2,5-thiophenediyl)bis[5-(1,1-dimethylethyl)-(7128-64-5)
EPA chemische Informationen	2,2'-(2,5-Thiophenediyl)bis[5-tert-butylbenzoxazole] (7128-64-5)

Sicherheit

R-Sätze:	36/37/38
S-Sätze:	24/25
WGK Germany	1
RTECS-Nr.	DM4888332
TSCA	Yes
HS Code	29349990
Toxizität	LD50 orl-rat: >10 g/kg MVCRB3 2,193,1973

Gefahreninformationscode (GHS)

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
Chemische Eigenschaften
light yellow-green crystals
Verwenden
Optical brightener additive in polymers, fibers, films, inks, laquers, and paints. In liquid scintillators.
Verwenden
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
Sicherheitsprofil
Low toxicity by ingestion. Whenheated to decomposition it emits toxic vapors of NOx andSOx.
Synthese
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

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.

2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene Upstream-Materialien And Downstream Produkte

2,5-Thiophendiylbis(5-tert-butyl-1,3-benzoxazol) Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

7128-64-5, 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene Verwandte Suche:

Send Inquriy