Recent advances in the chemistry of triaryl- and triheteroarylmethanes

Carbocations

“…78 Under treatment with a Lewis acid (LA), 2,2difluorovinyl ketones bearing an aryl group form carbocations [e.g. (37)] stabilized by α-fluorines. 79 These cations undergo Friedel-Crafts cyclization to give, after ketonization and loss of fluoride, dihydronaphthalenes such as (38).…”

X-ray structure and conformational study of tris(2-(dimethylamino)phenyl)methanol salt derivatives: Roles of anions and hydrogen bond

“…Due to the easy synthesis, the reported TAMs usually bear electron-donating groups (EDGs) on the para-position of their phenyl arms [4e7]. The losing of the fourth substituent group usually led to the formation of cation, radical or else anion of central carbon, in most cases, if sterically permitted, which would also exist in conjugated tautomeric forms [1,2]. Early researches on the ortho-substituted TAMs are less active because introducing substituents to the ortho position of aryl arms usually needs multi-step reactions [8,9].…”

Electrochromism of Crystal Violet Lactone in the presence of Fe(III)/Fe(II) redox pair

“…One example of leuco dyes are lactone derivatives of triphenylmethanes such as Crystal Violet Lactone (CVL, Fig. 1) [2][3][4][5]. In low-polar and non-acidic media, these molecules appear with a closed-ring due to the formation of a lactone, but in the presence of a so-called developer, the lactone ring opens and the coloured state appears.…”