4,4'-ビフェノール 化学特性,用途語,生産方法
外観
白色～うすい黄色粉末～結晶
用途
有機合成原料,合成樹脂
化学的特性
Powder
使用
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.
定義
ChEBI: A member of the class of hydroxybiphenyls that is biphenyl with hydroxy groups at positions 4 and 4'.
調製方法
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.
安全性プロファイル
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.
純化方法
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.]
4,4'-ビフェノール 上流と下流の製品情報
原材料
4,4'-ビス(トリメチルシリルオキシ)-1,1'-ビフェニル
6,6'-DI-TERT.BUTYL-4,4'-BI-ORTHO-CRESOL
4-ヒドロキシ-4'-メトキシビフェニル
4,4'-ジメトキシビフェニル
2,2',6,6'-テトラ-tert-ブチル-4,4'-ビフェノール
4'-フルオロビフェニル-4-オール
4,4'-ジフルオロビフェニル
4-クロロフルオロベンゼン
4-ブロモフェノール
準備製品
4-シアノ-4'-ヒドロキシビフェニル
4,4′-(ビフェニル-4,4′-ジイルビスオキシ)ビス[3-(トリフルオロメチル)アニリン]
3,3',5,5'-tetraformyl-4,4'-biphenyldiol
4,4'-ビフェニルジカルボニトリル
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