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ChemicalBook Optimization Suppliers |
| 名前: |
Alfa Aesar |
| 電話番号: |
400-6106006 |
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saleschina@alfa-asia.com |
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| 主な危険性 | F,Xi | | Rフレーズ | 11-36/37/38 | | Sフレーズ | 16-26-36 | | RIDADR | UN 1325 4.1/PG 2 | | WGK Germany | 3 | | TSCA | Yes | | 国連危険物分類 | 4.1 | | 容器等級 | III | | HSコード | 29029090 |
| | ペンタメチルベンゼン Usage And Synthesis |
| 外観 | 無色～うすい黄色、固体 | | 化学的特性 | Pentamethylbenzene is a white to light yellow crystalline powder with a sweet odor. The compound is classified as an aromatic hydrocarbon. It is a relatively easily oxidized benzene derivative, with E1/2 of 1.95 V vs NHE. | | 使用 | Pentamethylbenzene was used to prepare a mixture of nitropentamethylbenzene and 2,3,4,5-tetramethylbenzyl nitrate. It was also used to prepare propene. | | 定義 | ChEBI: Pentamethylbenzene is a methylbenzene that is benzene in which five of the hydrogens are replaced by methyl groups. | | Synthesis Reference(s) | Synthesis, p. 979, 1985 DOI: 10.1055/s-1985-31413 | | 合成 | Pentamethylbenzene is obtained as a minor product in the Friedel–Crafts methylation of xylene to durene (1,2,4,5-tetramethylbenzene). Like durene, pentamethylbenzene is rather electron-rich and undergoes electrophilic substitution readily. Indeed, it is used as a scavenger for carbocations.
Pentamethylbenzene has been observed as an intermediate in the formation of hexamethylbenzene from phenol and alkylation of durene or pentamethylbenzene has been reported as a suitable starting material for the synthesis of hexamethylbenzene. | | 純化方法 | Successively crystallise it from absolute EtOH, aqueous EtOH, MeOH, toluene *C6H6, and dry it under vacuum. [Rader & Smith J Am Chem Soc 84 1443 1962.] It has also been sublimed. The 1,3,5-trinitrobenzene complex (1:1) has m 121o (EtOH). [Beilstein 5 H 443, 5 III 1010, 5 IV 1109.] | | 予防処置 | Incompatible with oxidizing agents. Store in cool place. Keep container tightly closed in a dry and well-ventilated place. |
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