benzidine

ben·zi·dine

B0194300 (bĕn′zĭ-dēn′)n. A carcinogenic yellowish, white, or reddish-gray crystalline powder, C₁₂H₁₂ N₂, that is a derivative of biphenyl, is used in dyes, and is used to detect blood stains and cyanide.

[benz(ene) + -id(e) + -ine.]

benzidine

(ˈbɛnzɪˌdiːn; -dɪn) n (Elements & Compounds) a grey or reddish poisonous crystalline powder that is used mainly in the manufacture of dyes, esp Congo red. Formula: NH2(C6H4)2NH2

ben•zi•dine

(ˈbɛn zɪˌdin, -dɪn)

n. a crystalline base, C₁₂H₁₂N₂, used in the synthesis of azo dyes, esp. Congo red. [1875–80; benz- + -idine]

Benzidine

enUK

benzidine

[′ben·zə‚dēn] (organic chemistry) NH₂C₆H₄C₆H₄NH₂ An aromatic amine with a melting point of 128°C; used as an intermediate in syntheses of direct dyes for cotton.

Benzidine

4,4’-diaminodiphenyl, an organic compound.

Clear, lustrous crystals that darken in air and under the influence of light because of oxidation. Melting point T_m= 128° C; boiling point T_b = 400°C. It is readily soluble in alcohol and ether; it is an aromatic diamine. It forms salts with solutions of organic and inorganic acids—for example, with HC1, a dichlorhydrate, and with H₂ SO₄, a monosulfate. Benzidine is obtained by the isomerization of hydrazobenzene under the action of mineral acids. Benzidine was first obtained by this method by N. N. Zinin in 1845. It is an important intermediate product in the production of azo dyes. It is also widely used in analytical chemistry for the qualitative and quantitative determination of various cations and anions that oxidize benzidine to colored compounds (to yellow in a strongly acidic medium and blue in a neutral medium). Benzidine is a carcinogenic substance; its maximum permissible concentration in air is 1 mg/m³.

benzidine

[ben´zĭ-dēn] a compound formed by the action of acids on hydrazobenzene, once widely used in testing for occult blood; its use is now limited because it is toxic and carcinogenic.

ben·zi·dine

(ben'zi-dēn), A p-diaminophenyl, previously used to detect stool blood and agueous sulfates and as a reagent in special stains; now identified as a carcinogen.

benzidine

A yellowish or reddish crystalline powder used in a test to detect small quantities of blood.

单词	benzidine
释义	benzidine enUK ben·zi·dine B0194300 (bĕn′zĭ-dēn′)n. A carcinogenic yellowish, white, or reddish-gray crystalline powder, C₁₂H₁₂ N₂, that is a derivative of biphenyl, is used in dyes, and is used to detect blood stains and cyanide. [benz(ene) + -id(e) + -ine.] benzidine (ˈbɛnzɪˌdiːn; -dɪn) n (Elements & Compounds) a grey or reddish poisonous crystalline powder that is used mainly in the manufacture of dyes, esp Congo red. Formula: NH2(C6H4)2NH2 ben•zi•dine (ˈbɛn zɪˌdin, -dɪn) n. a crystalline base, C₁₂H₁₂N₂, used in the synthesis of azo dyes, esp. Congo red. [1875–80; benz- + -idine] Benzidine enUK benzidine [′ben·zə‚dēn] (organic chemistry) NH₂C₆H₄C₆H₄NH₂ An aromatic amine with a melting point of 128°C; used as an intermediate in syntheses of direct dyes for cotton. Benzidine 4,4’-diaminodiphenyl, an organic compound. Clear, lustrous crystals that darken in air and under the influence of light because of oxidation. Melting point T_m= 128° C; boiling point T_b = 400°C. It is readily soluble in alcohol and ether; it is an aromatic diamine. It forms salts with solutions of organic and inorganic acids—for example, with HC1, a dichlorhydrate, and with H₂ SO₄, a monosulfate. Benzidine is obtained by the isomerization of hydrazobenzene under the action of mineral acids. Benzidine was first obtained by this method by N. N. Zinin in 1845. It is an important intermediate product in the production of azo dyes. It is also widely used in analytical chemistry for the qualitative and quantitative determination of various cations and anions that oxidize benzidine to colored compounds (to yellow in a strongly acidic medium and blue in a neutral medium). Benzidine is a carcinogenic substance; its maximum permissible concentration in air is 1 mg/m³. benzidine enUK benzidine [ben´zĭ-dēn] a compound formed by the action of acids on hydrazobenzene, once widely used in testing for occult blood; its use is now limited because it is toxic and carcinogenic. ben·zi·dine (ben'zi-dēn), A p-diaminophenyl, previously used to detect stool blood and agueous sulfates and as a reagent in special stains; now identified as a carcinogen. benzidine A yellowish or reddish crystalline powder used in a test to detect small quantities of blood.
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