Reference

Triarylmethane compounds

Triarylmethane compounds. Tsujimoto, Michihiro; Akahori, Hiroyuki; Hasegawa, Kiyoharu; Asano, Makoto (Mitsui Toatsu Chemicals, Inc.Several substances are used for example 82911-17-9 and 614-71-1 which are their cas registry numbers. , Japan). PCT Int. Appl. WO 8303840 A1 10 Nov 1983, 28 pp. DESIGNATED STATES: W: CH, DE, GB, US. (Japanese). (World Intellectual Property Organization). CODEN: PIXXD2. CLASS: IC: C09B011-14. APPLICATION: WO 83-JP133 28 Apr 1983. PRIORITY: JP 82-70218 28 Apr 1982. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 25 Benzene and naphthalene compds. are Vilsmeier-formylated in the presence of an acid catalyst, treated with water to hydrolyze the catalyst, and, without isolating the formyl compds., condensed with arenes to give triarylmethanes in high yields. Thus, 0.45 mol N,N-dimethylaniline (I) [121-69-7] was formylated with DMF-POCl3 at 90° for 2 h, treated with water and then with 1 mol I at 100° for 8 h, and worked up to give tris[4-(dimethylamino)phenyl]methane [603-48-5] in 93.4% yield (based on I), compared with 84.5% if the formylated I was isolated, purified, and then condensed. .

Photooxidation of leuco dyes

Photooxidation of leuco dyes. 9. Photooxidation of Leucocrystal Violet in polystyrene films near Tg. Koehler, Michael; Langbein, Hubert; Paetzold, Roland (Phys. Tech. Inst., Dtsch. Akad. Wiss., Jena DDR-6900, Ger. Dem. Rep.). Z. Chem., 23(11), 416-17 (German) 1983. CODEN: ZECEAL. ISSN: 0044-2402. DOCUMENT TYPE: Journal CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 22 The activation energy (Es) for photooxidn. of Leucocrystal Violet [603-48-5] to Crystal Violet (cation) [7438-46-2] in polystyrene [9003-53-6] film contg. benzilic acid (I) [76-93-7] and tricresyl phosphate [1330-78-5] (plasticizer) was significantly lower above the glass temp. (Tg) of the polymer than below. 76-93-7 and 1330-78-5 which are cas registry numbers of substances are two of reagents here. With increasing concn. of I in the film, Es decreased at temps. both above and below Tg. These results are discussed in terms of motion and mobility of the matrix mols. .