トリフェニルメタン

化学的特性colorless or light brown powder. soluble in nonpolar organic solvents and not in water. Triphenylmethane is the basic skeleton of many synthetic dyes called triarylmethane dyes, many of them are pH indicators, and some display fluorescence. A trityl group in organic chemistry is a triphenylmethyl group Ph3C, e.g. triphenylmethyl chloride (trityl chloride) and the triphenylmethyl radical (trityl radical).

解説トリフェニルメタン．ベンゼン3分子とクロロホルムとをフリーデル-クラフツ縮合させると得られる．二つの結晶形(アルコール溶媒)が知られており，不安定形は融点81 ℃，安定形は融点94 ℃．沸点359 ℃．λmax 256，262，269 nm(log ε 2.86，2.92，2.81)．エーテル，クロロホルムなどに可溶．中心炭素に結合した水素は，弱い酸性(pKa 32.5)を示し，金属類と反応して深赤色のトリフェニルメタニドアニオン溶液を与え，酸化すればトリフェニルメタノールになる．

使用Triphenylmethane is a triarylmethane compound used as the backbone of synthetic dyes. Triphenylmethane has also been shown to inhibit 3-methylcholanthrene-induced neoplastic transformation of 10T1/2 cells.

製造方法Triphenylmethane can be synthesized by Friedel–Crafts reaction from benzene and chloroform with aluminium chloride catalyst: 3 C6H6 + CHCl3 → Ph3CH + 3 HCl

純化方法Crystallise triphenylmethane from EtOH or *benzene (with one molecule of *benzene of crystallisation which is lost on exposure to air or by heating on a water bath). It can also be sublimed under vacuum. It has been given a preliminary purification by refluxing with tin and glacial acetic acid, then filtered hot through a glass sinter disc, and precipitated by addition of cold water. [Beilstein 5 H 698, 5 IV 2495.]