4081-02-1Relevant articles and documents
The Reaction of 2,4,6-Trihalophenols with Tropylium Perchlorate. A New Route for Triphenylmethane-Type Pigments
Morita, Tadayoshi,Takahashi, Kazuko,Nozoe, Tetsuo
, p. 337 - 339 (1993)
The reaction of 2,4,6-tribromo- and triiodophenols with tropylium perchlorate in the presence of triethylamine gave 4-(3,5-dihalo-4-hydroxy-α-phenylbenzylidene)-2,6-dihalo-2,5-cyclohexadien-1-ones, respectively.
Metal- And solvent-free synthesis of aniline- And phenol-based triarylmethanes: Via Br?nsted acidic ionic liquid catalyzed Friedel-Crafts reaction
Jaratjaroonphong, Jaray,Saeeng, Rungnapha,Senapak, Warapong,Sirion, Uthaiwan,ponpao, nipaphorn
, p. 22692 - 22709 (2021/07/21)
A beneficial, scalable and efficient methodology for the synthesis of aniline-based triarylmethanes has been established through the double Friedel-Crafts reaction of commercial aldehydes and primary, secondary or tertiary anilines using Br?nsted acidic ionic liquid as a powerful catalyst, namely [bsmim][NTf2]. This protocol was successfully performed under metal- and solvent-free conditions with a broad range of substrates, giving the corresponding aniline-based triarylmethane products in good to excellent yields (up to 99%). In addition, alternative aromatic nucleophiles such as phenols and electron-rich arenes were also studied using this useful approach to achieve a diversity of triarylmethane derivatives in high to excellent yields. This journal is
METHOD FOR PRODUCING BISPHENOL COMPOUND
-
Paragraph 0191; 0194, (2019/12/31)
PROBLEM TO BE SOLVED: To provide a method for producing an aldehyde bisphenol compound, wherein a 4,4'-substituted body is obtained efficiently and easily with significantly high regioselectivity. SOLUTION: When producing an aldehyde bisphenol compound from a phenol and an aldehyde, a heteropoly acid is used as an acid catalyst, the heteropoly acid represented by the following formula (I): Hn(X2Y18O62) [where, n is an integer of 1 or greater, represented by the following formula (II), X is a p-valent atom of Groups 7 to 16 in the periodic table, excluding the oxygen atom, Y is a p-valent atom of Groups 5 to 6 in the periodic table, where p and q are valences of X and Y and represented by the number of 1 or more]. The formula (II): n=124-2p-18q [where, n, p and q are the same as described in the formula (I)]. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT
Solventless triarylmethane synthesis via hydroxyalkylation of anisole with benzaldehyde by modified heteropoly acid on mesocellular foam silica (MCF)
Bhadra, Kalpesh H.,Yadav, Ganapati D.
, p. 150 - 158 (2018/06/18)
Triarylmethane (TRAM) compounds have wide applications such as leuco dyes for sensing tumors and other biological activities. Hydroxyalkylation of arenes with benzaldehyde results in formation of triarylmethane compounds. In the present study, 20 (wt.%) Cs2.5H0.5PW12O40 (Cs-DTP) supported on mesocellular foam (MCF) silica was prepared, characterized and tested for its activity in hydroxyalkylation reaction of anisole with benzaldehyde. Its activity was compared with commercial catalysts like Amberlyst-15, montmorillonite clay K-10, H3PW12O40 and unsupported Cs2.5H0.5PW12O40.The prepared catalyst showed the best activity compared to others with advantage of separation of catalyst and reusability. Reaction parameters were studied in detail and kinetic study was carried out for the said reaction. 20 (wt. %) Cs-DTP/MCF was found to be the best, robust and reusable catalyst. Reaction mechanism and kinetics were also studied. The results are new.
