1533-45-5

Basic information

• Product Name: 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole
• Synonyms: 4,4'-BIS(2-BENZOXAZOLYL)STILBENE;2,2'-(1,2-ETHENEDIYLDI-4,1-PHENYLENE)BISBENZOXAZOLE;2,2'-(vinylenedi-p-phenylene)bisbenzoxazole;2,2’-(1,2-ethenediyldi-4,1-phenylene)bis-benzoxazol;fluorescentbrightener393;Fluorescent Brightener OB-1;Optical Brightening Agent OB-1 C. I. 393;OpticalBrighteningAgentOB-1C.I.
• CAS NO: 1533-45-5
• Molecular Formula: C₂₈H₁₈N₂O₂
• Molecular Weight: 414.45
• EINECS: 216-245-3
• Product Categories: Industrial/Fine Chemicals;Stilbenes;Building Blocks;Heterocyclic Building Blocks;Oxazoles;brightener
• Mol File: 1533-45-5.mol

Chemical Properties

• Melting Point: >300 °C(lit.)
• Boiling Point: 533.34°C (rough estimate)
• Flash Point: 285.1 °C
• Appearance: solid
• Density: 1.2151 (rough estimate)
• Vapor Pressure: 2.79E-12mmHg at 25°C
• Refractive Index: 1.5800 (estimate)
• Storage Temp.: -20°C
• Solubility: DMSO (Slightly, Heated)
• PKA: 1.45±0.10(Predicted)
• Water Solubility: 10μg/L at 25℃
• Stability: Stable. Incompatible with strong oxidizing agents.
• CAS DataBase Reference: 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole(CAS DataBase Reference)
• NIST Chemistry Reference: 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole(1533-45-5)
• EPA Substance Registry System: 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole(1533-45-5)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 26-37/39-24/25
• WGK Germany: 1
• Hazardous Substances Data: 1533-45-5(Hazardous Substances Data)

Usage

Uses

Used in Plastic Industry:
2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole is used as a viscosity-sensitive fluorophore for investigating the curing parameters in the fabrication of UV-cured automotive organic protective coatings.
Used in Sensor Technology:
2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole is used in the preparation of polymeric film sensors based on excimer luminescence and responsive to both mechanical and temperature stress. It is dispersed into a thermoplastic aliphatic biodegradable polyester [poly(1,4-butylene succinate)] to create these sensors.
Used as a Food-Grade Dye:
2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole is used as a dye in the food industry due to its bright yellow color and greenish shade.
Used in Research and Development:
2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole is used as an excimer-forming, photoluminescent chromophore in various research and development applications, particularly in the study of photophysics and fluorescence properties.

Flammability and Explosibility

Notclassified

TEST ITEMS

SPECIFICATION

METLING POINT

355-360 ° C

PURITY

98.5% min

FINENESS

300 mesh min

InChI:InChI=1/C28H18N2O2/c1-3-7-25-23(5-1)29-27(31-25)21-15-11-19(12-16-21)9-10-20-13-17-22(18-14-20)28-30-24-6-2-4-8-26(24)32-28/h1-18H/b10-9+

Upstream product

• 24239-07-4 2-(4-bromomethylphenyl)benzoxazole 
• 1533-44-4 C₂₈H₂₂N₂O₄ 
• 100-31-2 Stilbene-4,4'-dicarboxylic acid 
• 52238-17-2 4,4'-stilbenedicarbonyl dichloride 
• 835-71-2 2-(4-methylphenyl)-1,3-benzoxazole 

Relevant articles and documents

Production process of fluorescent whitening agent OB-1

The invention relates to a production process of a fluorescent whitening agent OB-1. The production process specifically comprises the following steps: 1, carrying out condensation reaction on p-toluic acid and o-aminophenol to generate 4-methyl phenyl benzoxazole; 2, carrying out distillation treatment after the condensation reaction is finished, and collecting a main fraction 4-methyl intermediate; 3, adding methanol into the main fraction, keeping the temperature at 60 DEG C for 6 hours, cooling to 10 DEG C, centrifugally filtering, drying, and transferring into a vulcanization synthesis kettle; 4, carrying out a vulcanization synthesis reaction on the 4-methyl intermediate to generate OB-1, rinsing with xylene, repeatedly washing with xylene, and drying the xylene by distillation to obtain a dried OB-1 crude product; 5, adding trichlorobenzene, the OB-1 crude product and activated carbon into a refining kettle to refine OB-1; and 6, pulping and washing OB-1 with methanol, carryingout centrifugal separation, and drying a filtering cake to obtain the OB-1 product. The method is environmentally friendly, safe and high in yield.

Preparation 2, the 2 [...] -(4,4 the- [...]benzoin ethenyl ) method of the double-benzoxazole

The invention discloses a method for preparing a 2, 2'-(4,4'-distyrylphenyl) phenylene benzobisoxazole competitive product. The method comprises the steps of condensation reaction, sulfurization reaction, refining, solid-liquid separation and the like. In the refining step of a crude product, the crude product is refined and desulphurized under the effect of 30% NaOH solution, the desulphurization rate is high, the purity of the product OB-1 can reach 99 percent, the yield is high, the quality is good, the color is bright, and the application performance is greatly improved; after the traditional dimethylbenzene is substituted by 30% NaOH solution to be used as the desulphurization washing agent, the production safety coefficient is high, safety in operation is realized, and the cost is low. The method can be used for preparing fluorescent whitening agent OB-1 which is used as an auxiliary material for the materials such as plastics, paint, road line paint and the like.

Synthesis and spectral-luminescence properties of 4,4′-di(2-oxazolyl)-stilbenes and 4,4′-di(2-oxazolyl)tolans

A new method is proposed for the synthesis of 4,4′-di(2-oxazolyl)stilbenes and 4,4′-di(2-oxazolyl) tolans by condensation of oxazolyl-substituted benzyl bromides or benzal dibromides under the influence of strong bases (KOH, potassium tertbutoxide) in dipolar aprotic solvents [dimethylformamide (DMF) and dimethyl sulfoxide (DMSO)]. The synthesized compounds luminesce intensely over the spectral range 386-492 nm.

Eine einfache Methode zur Herstellung von Benzoxazolen

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.