benzenediamine. C 6 H 8 N 2 (108.14). C 6 H 4 (NH 2 ) 2 . Also called diaminobenzene. There are three isomers, o- , m- , and p -phenylenediamine, depending on the relative positions of the two amino groups. o- and p -phenylenediamines are produced by reducing the corresponding nitroanilines, and m -phenylenediamine is produced by reducing m -dinitrobenzene. [ I ] o -Phenylenediamine: Light brown plate crystals. Melting point 102-103°C, boiling point 257°C. K a 3.3×10 -10 (25°C). Soluble in ethanol, ether, chloroform, etc. Produces various heterocyclic compounds by condensation reaction, and is used to detect 1,2-diketones. LD 50 1070 mg/kg (rat, oral). [ II ] m -Phenylenediamine: White crystals, but oxidizes in air to reddish brown. Melting point 63-64°C, boiling point 287°C. Easily soluble in water and ethanol, poorly soluble in benzene and toluene. Used in ion exchange resins, photographic materials, and more. LD 50 650 mg/kg (rat, oral). [ III ] p -Phenylenediamine: Plate crystals. Melting point 140°C, boiling point 267°C. Oxidizes in air to brown. Soluble in ethanol, chloroform, and ether, slightly soluble in cold water. Dyes fur and hair black. N,N -Dimethyl form shows α-naphthol and indophenol coloring. LD 50 80 mg/kg (rat, oral). Both are widely used as intermediates for azo dyes and sulfide dyes. They are also highly irritating to the skin and may be carcinogenic. Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
benzenediamine.C6H8N2(108.14).C6H4(NH2)2.ジアミノベンゼンともいう.二つのアミノ基の相対的位置によりo-,m-およびp-フェニレンジアミンの3種類の異性体がある.o-およびp-フェニレンジアミンは,それぞれ対応するニトロアニリンを還元して,m-フェニレンジアミンは,m-ジニトロベンゼンを還元してつくられる.【Ⅰ】o-フェニレンジアミン:淡褐色の板状晶.融点102~103 ℃,沸点257 ℃.Ka 3.3×10-10(25 ℃).エタノール,エーテル,クロロホルムなどに可溶.縮合反応により種々の複素環化合物を生じ,1,2-ジケトンの検出に用いられる.LD50 1070 mg/kg(ラット,経口).【Ⅱ】m-フェニレンジアミン:白色の結晶であるが,空気中で酸化されて赤褐色となる.融点63~64 ℃,沸点287 ℃.水,エタノールに易溶,ベンゼン,トルエンなどに難溶.イオン交換樹脂,写真用材,そのほかに使用される.LD50 650 mg/kg(ラット,経口).【Ⅲ】p-フェニレンジアミン:板状晶.融点140 ℃,沸点267 ℃.空気中で褐色に酸化される.エタノール,クロロホルム,エーテルに可溶,冷水に微溶.毛皮や毛髪を黒く染める.N,N-ジメチル体はα-ナフトールとインドフェノール呈色を示す.LD50 80 mg/kg(ラット,経口).これらは共通して,アゾ染料や硫化染料の中間物として広く利用されている.また,皮膚に強い刺激性をもち,発がん性の可能性がある. 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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