3,4-ジメチルフェノール 化學(xué)特性,用途語(yǔ),生産方法
外観
白色～褐色又はわずかにうすい赤色, 結(jié)晶～結(jié)晶性粉末又は塊
溶解性
エタノール及びアセトンに溶けやすく、水にほとんど溶けない。
用途
醫(yī)薬?農(nóng)薬(殺蟲剤)?酸化防止剤?レジスト樹脂原料
化學(xué)的特性
YELLOW TO BROWNISH CRYSTALLINE MASS
天然物の起源
Reported found in coffee, tomato, parmesan and romano cheese, smoked fatty fish, white wine, katsuobushi
(dried bonito) and wood vinegar.
使用
Applications of 3,4-dimethylphenol:
- It can react with ethyl cinnamates in trifluoroacetic acid to form the corresponding dihydrocoumarin derivatives.
- Bromination of 3,4-dimethylphenol using bromine can lead to 6-bromo-3,4-dimethylphenol.
- It can react with 1-fluoro-4-chloromethyl-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoro-borate) (Selectfluor F-TEDA-BF4) to form 4-fluoro-3,4-dimethylcyclohexa-2,5-dienone.
一般的な説明
Colorless to light tan crystalline powder or solid. Odor threshold 1.2 mg/L. Taste threshold 0.05 mg/L.
空気と水の反応
Hygroscopic. Insoluble in water.
反応プロフィール
3,4-Dimethylphenol is incompatible with bases, acid chlorides, acid anhydrides, and oxidizing agents. 3,4-Dimethylphenol corrodes steel, brass, copper, and copper alloys.
火災(zāi)危険
Flash point data for 3,4-Dimethylphenol are not available. 3,4-Dimethylphenol is probably combustible.
純化方法
Heat 3,4-xylenol with an equal weight of conc H2SO4 at 103-105o for 2-3hours, then dilute it with four volumes of water, reflux it for 1hour, and either steam distil or extract it repeatedly with diethyl ether after cooling to room temperature. The steam distillate is also extracted and evaporated to dryness. (The purification process depends on the much slower sulfonation of 3,4-dimethylphenol than most of its likely contaminants.). It can also be crystallised from water, hexane or pet ether, and sublimed in a vacuum. [Kester Ind Eng Chem (Anal Ed) 24 770 1932, Bernasconi & Paschalis J Am Chem Soc 108 29691986, Beilstein 6 IV 3099.]
3,4-ジメチルフェノール 上流と下流の製品情報(bào)
原材料
準(zhǔn)備製品