Biphenyl-4,4'-diol Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R21:Gesundheitsschädlich bei Berührung mit der Haut.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R36:Reizt die Augen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
Chemische Eigenschaften
Powder
Verwenden
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.
Definition
ChEBI: A member of the class of hydroxybiphenyls that is biphenyl with hydroxy groups at positions 4 and 4'.
Vorbereitung Methode
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.
Sicherheitsprofil
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.
läuterung methode
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.]
Biphenyl-4,4'-diol Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
4'-Hydroxy-4-biphenylcarbonitrile
6fapbp
3,3',5,5'-tetraformyl-4,4'-biphenyldiol
[1,1'-Biphenyl]-4,4'-dicarbonitril
Cyanic acid, [1,1'-biphenyl]-4,4'-diyl ester
[1,1'-biphenyl]-4,4'-diyl bis(2-Methylacrylate)
3,3',5,5'-tetrabromo-[1,1'-biphenyl]-4,4'-diol
