7128-64-5 Usage
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 lubricants2-4.
Sources
https://pubchem.ncbi.nlm.nih.gov/compound/bbot#section=Top
https://www.alfa.com/zh-cn/catalog/A14928/
http://www.xcolorpigment.com/FLUORESCENT-BRIGHTENER-OB.html
http://www.offerchems.com/products/catalyst-auxiliary/fluorescent-brightener-184-cas-7128-64-5/
Chemical Properties
light yellow-green crystals
Uses
Different sources of media describe the Uses of 7128-64-5 differently. You can refer to the following data:
1. Optical brightener additive in polymers, fibers, films, inks, laquers, and paints. In liquid scintillators.
2. 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
Notclassified
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.
TEST ITEMS
SPECIFICATION
APPEARANCE
LIGHT YELLOW OR MILK WHITE POWDER
SHADE
LIGHT YELLOWISH
METLING POINT
201-202
°
C
SOLUBILITY
hardly soluble in water,but soluble in paraffin, mineral oils and ordinary organic solvents.
Check Digit Verification of cas no
The CAS Registry Mumber 7128-64-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,1,2 and 8 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 7128-64:
(6*7)+(5*1)+(4*2)+(3*8)+(2*6)+(1*4)=95
95 % 10 = 5
So 7128-64-5 is a valid CAS Registry Number.
InChI:InChI=1/C26H26N2O2S/c1-25(2,3)15-7-9-19-17(13-15)27-23(29-19)21-11-12-22(31-21)24-28-18-14-16(26(4,5)6)8-10-20(18)30-24/h7-14H,1-6H3
7128-64-5Relevant articles and documents
Metal-Free Oxidative Condensation of Catechols, Aldehydes and NH4OAc towards Benzoxazoles
Dong, Jianyu,Geng, Furong,Su, Lebin,Wu, Shaofeng,Yin, Shuang-Feng,Zhou, Dan,Zhou, Yongbo
supporting information, p. 3607 - 3614 (2021/07/28)
Benzoxazoles extensively exist in biologically active compounds, natural products, pharmaceuticals and functional materials. Thus, facile and green synthesis of such valuable compounds from easily available substrates will make a contribution to drug, material, and fine chemistry. A method for the synthesis of benzoxazoles from catechols, aldehydes and ammonium acetate is developed using NaIO4 as oxidant under metal- and additive-free conditions. A broad range of benzoxazoles including some fluorescent whitening agents, JTP-426467 and tafamidis analogues are synthesized in 56–95% yields with outstanding functional group tolerance. Mechanistic investigations suggest that an interesting o-iminocyclohexa-diene alcohol intermediate is involved in the reaction. These salient features of the protocol make it an alternative for the synthesis of benzoxazoles. (Figure presented.).
Process for preparing particles which have a hydrophilic core coated with a hydrophobic polymeric layer
-
, (2016/06/01)
This method of preparing particles having a hydrophilic core coated with a hydrophilic core coated with a hydrophobic polymeric layer includes the steps of: preparing an aqueous phase comprising at least one hydrophilic optical brightener or colorant; preparing an organic phase including at least one hydrophobic polymer; forming a water-in-oil inverse emulsion by adding the aqueous phase into the organic phase; forming the particles by thermal quenching of the emulsion; and isolating the particles thus obtained.
Eine einfache Methode zur Herstellung von Benzoxazolen
Seha, Zdenek,Weis, Claus D
, p. 413 - 419 (2007/10/02)
The preparation of benzoxazoles by a facile one-pot reaction is reported.The reaction of carboxylic acids with 2-chloro-N-methyl-Δ1-pyrrolinium chloride in an excess of N-methyl-2-pyrrolidone afforded carboxylic acid chlorides which were converted subsequently to their 2-hydroxyanilides by addition of 2-aminophenols.Cyclization of the 2-hydroxy-anilides at elevated temperatures furnished the benzoxazoles in high yield and purity.