Detail of "2735-04-8"

Reference

Tetracenequinone dyes

Tetracenequinone dyes. Imahori, Seiichi; Okada, Itaru; Gokan, So (Mitsubishi Chemical Industries Co., Ltd., Japan). Japan. Kokai JP 52040684 29 Mar 1977 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: D06P001-16. APPLICATION: JP 75-117353 29 Sep 1975. DOCUMENT TYPE: Patent CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Section cross-reference(s): 26 I (R = H) [63339-76-4], yellowish red on polyester and acetate fibers, was prepd. from 2,3-naphthalenedicarboxylic anhydride [716-39-2] and 2,4-dimethoxyaniline (II) [2735-04-8] in the presence of boric acid-H2SO4, and similarly, I (R = Br) [63339-77-5], bluish red on polyester fiber, from 5,8-dibromo-2,3-naphthalenedicarboxylic anhydride [42523-61-5] and II.

Pure cationic dyes

Pure cationic dyes. (BASF A.-G., Ger.). Belg. BE 837655 16 Jul 1976, 19 pp. (Unavailable). (Belgium). CODEN: BEXXAL. CLASS: IC: C09B. APPLICATION: BE 76-837655 16 Jan 1976. DOCUMENT TYPE: Patent CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Cationic dyes [I, R = H, Me, Cl, MeO; R1 = Me, Et, PhCH2; R2 = H, R3 = substituted phenyl, or R2R3N = N-contg. heterocycle], used for dyeing acrylic fibers, were prepd. in high yield and purity by condensing 1,3,3-trimethyl-2-indolinylideneacetaldehyde (II) [84-83-3] and its deriv. with R2R3N in the presence of a carboxylic or an arom. sulfonic acid, optionally a mineral acid, and an inert org. solvent at 20-40.degree. There are some commonly used reagents like 59737-28-9 in this article.. Thus, a soln. of II 303 and 2,4-(MeO)2C6H3NH2 [2735-04-8] 230 in MeOH [67-56-1] 900 and HCO2H [64-18-6] 80 parts was stirred 15-20 min at 20-30.degree. and H2SO4 was added dropwise to give 89.2% I(R = R2 = H, R1 = Me, R3 = 2,4-(MeO)2C6H3, X = HSO4) [59737-31-4]. .