4,4'-Biphenol
Synonym(s):4,4′-Biphenol;4,4′-Biphenyldiol;4,4′-Diphenol
- CAS NO.:92-88-6
- Empirical Formula: C12H10O2
- Molecular Weight: 186.21
- MDL number: MFCD00002348
- EINECS: 202-200-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-08-24 19:19:26
What is 4,4'-Biphenol?
Chemical properties
Powder
The Uses of 4,4'-Biphenol
4,4'-biphenol be used intermediate liquid crystal polymers raw materials. Synthetic polymers, due to its excellent heat resistance, it is used as polyester, urethane modified monomer, polycarbonate, polysulfone, and epoxy resin, for the manufacture of an excellent engineering plastics and composite materials. Antioxidant antioxidants for rubber and plastics. Dye intermediates or petroleum products stabilizer.
The Uses of 4,4'-Biphenol
Intermediates of Liquid Crystals
The Uses of 4,4'-Biphenol
Biphenol is an intermediate used in the manufacture of thermoplastics such as liquid crystalline polymers (LCP), polyesters, polycarbonates and polysulfones.
Definition
ChEBI: A member of the class of hydroxybiphenyls that is biphenyl with hydroxy groups at positions 4 and 4'.
Production Methods
4,4'-Biphenol can be synthesized in excellent yields by debutylation of 3,3',5,5'-tetra-tert-butyl-4,4'-dihydroxybiphenyl. Other production processes are the alkaline fusion of 4,4'-biphenyldisulfonic acid, the boil down of benzidinebisdiazonium salts, and the decarboxylation of 4,4'-dihydroxybiphenyl-2-carboxylic acid. Symmetrically alkylated 4,4'-dihydroxybiphenyls such as 4,4'-dihydroxy-2,2',3,3',5,5',6,6'-hexamethylbiphenyl are preferably obtained by the oxidative coupling of the corresponding substituted monophenols. Here, diphenoquinones are generally formed in the first step which must be reduced. Phenol itself always gives isomeric mixtures of dihydroxybiphenyls on coupling with various oxidants. These mixtures are also formed by alkaline fusion of 4,4'-dihydroxybiphenylsulfone.
Flammability and Explosibility
Not classified
Safety Profile
Poison by intraperitoneal route.Moderately toxic by skin contact. Mildly toxic byingestion. Human mutation data reported. When heated todecomposition it emits acrid smoke and irritating fumes.
Purification Methods
Recrystallise the biphenol from aqueous EtOH preferably under N2 to avoid oxidation to the extended qiunone. It is characterized as the dimethyl derivative (4,4’-dimethoxybiphenyl) from which it is prepared by demethylation. The dimethoxy derivative has m 176.5-177o (from AcOH, EtOH, hexane or *C6H6) and sublimes in vacuo. [Williamson & Rodebush J Am Chem Soc 63 3019 1941, Beilstein 6 I 485, 6 II 962, 6 III 6389, 6 IV 6651.]
Properties of 4,4'-Biphenol
Melting point: | 280-282 °C(lit.) |
Boiling point: | 280.69°C (rough estimate) |
Density | 1.22 |
vapor pressure | 0Pa at 25℃ |
refractive index | 1.6010 (estimate) |
storage temp. | Sealed in dry,Room Temperature |
pka | 9.74±0.26(Predicted) |
form | Powder |
color | Off-white to light beige or light gray |
Water Solubility | sparingly soluble |
BRN | 1908886 |
CAS DataBase Reference | 92-88-6(CAS DataBase Reference) |
NIST Chemistry Reference | p,p'-Biphenol(92-88-6) |
EPA Substance Registry System | 4,4'-Biphenyldiol (92-88-6) |
Safety information for 4,4'-Biphenol
Signal word | Warning |
Pictogram(s) |
Flame Flammables GHS02 Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H252:Self-heating substances and mixtures H317:Sensitisation, Skin H412:Hazardous to the aquatic environment, long-term hazard |
Precautionary Statement Codes |
P235:Keep cool. P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P272:Contaminated work clothing should not be allowed out of the workplace. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. |
Computed Descriptors for 4,4'-Biphenol
Abamectin manufacturer
Metropolitan Eximchem Pvt Ltd (Metropolitan Group)
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