pyrrole

pyr·role

P0691400 (pîr′ōl′)n.1. A five-membered heterocyclic ring compound, C₄H₅N, having an odor similar to chloroform, that is the parent compound of protoporphyrin.2. Any of various derivatives of this compound.

[Greek purros, red (from pūr, fire; see pyre) + -ole.]

pyr·ro′lic (pĭ-rō′lĭk) adj.

pyrrole

(ˈpɪrəʊl; pɪˈrəʊl) n (Elements & Compounds) a colourless insoluble toxic liquid having a five-membered ring containing one nitrogen atom, found in many naturally occurring compounds, such as chlorophyll. Formula: C4H5N. Also called: azole [C19: from Greek purrhos red, from pur fire +-ole¹] pyrrolic adj

pyr•role

(pɪˈroʊl, ˈpɪr oʊl)

n. a colorless, toxic, liquid, five-membered ring compound, C₄H₅N, that is a component of chlorophyll and hemin. [1825–35; < Greek pyrr(hós) red] pyr•rol•ic (pɪˈrɒl ɪk, -ˈroʊ lɪk) adj.

Pyrrole

pyrrole

[′pi‚rōl] (organic chemistry) C₄H₅N Water-insoluble, yellowish oil, with pungent taste; soluble in alcohol, ether, and dilute acids; boils at 130°C; polymerizes in light; used to make drugs.

Pyrrole

a heterocyclic compound; colorless liquid that darkens rapidly upon exposure to air. Melting point, — 23.42°C; boiling point, 130°C; density, 0.9698 g/cm³ at 20°C. Moderately soluble in water. Pyrrole is a very weak acid; it forms a salt with potassium or anhydrous caustic potash. It resinifies under the influence of acids, and it oxidizes readily. It hydrogenates with H₂ over Ni at 200°C to pyrrolidine.

Pyrrole was first isolated from coal tar. It is produced commercially

by dry distillation of the ammonia salt of mucic acid or by passing a mixture of furan and NH₃ over Al₂O₃ at 400°–450°C. The pyrrole nucleus is a structural fragment of porphyrin molecules. Pyrrole is used in the production of pyrrolidine and in the synthesis of pharmaceuticals—for example, the antiseptic Iodol (2,3,4,5-tetraiodopyrrole).

pyrrole

[pir´ōl] a basic, cyclic substance, obtained by destructive distillation of various animal substances.

pyr·role

(pir'ōl), Divinylenimine; a heterocyclic compound found in many biologically important substances, for example, heme. Synonym(s): azole, imidole

pyrrole

(pîr′ōl′)n.1. A five-membered heterocyclic ring compound, C₄H₅N, having an odor similar to chloroform, that is the parent compound of protoporphyrin.2. Any of various derivatives of this compound.

pyr·ro′lic (pĭ-rō′lĭk) adj.

pyr·role

(pir'ōl) A heterocyclic compound found in many biologically important substances.
Synonym(s): azole, imidole.

pyrrole

a porphyrin building block that has a five-membered heterocyclic structure and contains nitrogen.

单词	pyrrole
释义	pyrrole pyr·role P0691400 (pîr′ōl′)n.1. A five-membered heterocyclic ring compound, C₄H₅N, having an odor similar to chloroform, that is the parent compound of protoporphyrin.2. Any of various derivatives of this compound. [Greek purros, red (from pūr, fire; see pyre) + -ole.] pyr·ro′lic (pĭ-rō′lĭk) adj. pyrrole (ˈpɪrəʊl; pɪˈrəʊl) n (Elements & Compounds) a colourless insoluble toxic liquid having a five-membered ring containing one nitrogen atom, found in many naturally occurring compounds, such as chlorophyll. Formula: C4H5N. Also called: azole [C19: from Greek purrhos red, from pur fire +-ole¹] pyrrolic adj pyr•role (pɪˈroʊl, ˈpɪr oʊl) n. a colorless, toxic, liquid, five-membered ring compound, C₄H₅N, that is a component of chlorophyll and hemin. [1825–35; < Greek pyrr(hós) red] pyr•rol•ic (pɪˈrɒl ɪk, -ˈroʊ lɪk) adj. Pyrrole pyrrole [′pi‚rōl] (organic chemistry) C₄H₅N Water-insoluble, yellowish oil, with pungent taste; soluble in alcohol, ether, and dilute acids; boils at 130°C; polymerizes in light; used to make drugs. Pyrrole a heterocyclic compound; colorless liquid that darkens rapidly upon exposure to air. Melting point, — 23.42°C; boiling point, 130°C; density, 0.9698 g/cm³ at 20°C. Moderately soluble in water. Pyrrole is a very weak acid; it forms a salt with potassium or anhydrous caustic potash. It resinifies under the influence of acids, and it oxidizes readily. It hydrogenates with H₂ over Ni at 200°C to pyrrolidine. Pyrrole was first isolated from coal tar. It is produced commercially by dry distillation of the ammonia salt of mucic acid or by passing a mixture of furan and NH₃ over Al₂O₃ at 400°–450°C. The pyrrole nucleus is a structural fragment of porphyrin molecules. Pyrrole is used in the production of pyrrolidine and in the synthesis of pharmaceuticals—for example, the antiseptic Iodol (2,3,4,5-tetraiodopyrrole). pyrrole pyrrole [pir´ōl] a basic, cyclic substance, obtained by destructive distillation of various animal substances. pyr·role (pir'ōl), Divinylenimine; a heterocyclic compound found in many biologically important substances, for example, heme. Synonym(s): azole, imidole pyrrole (pîr′ōl′)n.1. A five-membered heterocyclic ring compound, C₄H₅N, having an odor similar to chloroform, that is the parent compound of protoporphyrin.2. Any of various derivatives of this compound. pyr·ro′lic (pĭ-rō′lĭk) adj. pyr·role (pir'ōl) A heterocyclic compound found in many biologically important substances. Synonym(s): azole, imidole. pyrrole a porphyrin building block that has a five-membered heterocyclic structure and contains nitrogen.
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