Reference

Imides from a dicarboxylic acid anhydride and an amine

Imides from a dicarboxylic acid anhydride and an amine. (Rhone-Poulenc Industries, Fr.). Israeli IL 56545 A1 15 Jun 1983, 33 pp. 13676-54-5 and 3282-99-3 are also occured in this study. (English). (Israel). CODEN: ISXXAQ. CLASS: IC: C07D207-444; C07D209-48; C07D209-76. APPLICATION: IL 79-56545 30 Jan 1979. PRIORITY: IL 78-55314 8 Aug 1978; FR 78-36393 19 Dec 1978. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) N-Substituted imides are prepd. from a dicarboxylic acid and an amine in the presence of a catalyst system comprising a strong O-contg. acid and a pyridinium, phosphonium, or sulfonium salt of the acid. Thus, 3 mol p-toluidine [106-49-0] in 1 L Me2CO was treated with 3 mol maleic anhydride [108-31-6] in 2 L Me2CO over 2 h at 20° to give N-(p-tolyl)maleamic acid [24870-11-9], mixed (1.83 g) with a distd. mixt. contg. p-toluenesulfonic acid monohydrate [6192-52-5] 0.098, 1-methylpyridinium p-toluenesulfonate [38542-71-1] 0.505, and PhCl 160 g, and distd. 2 h at 132° to give 4.64 mM N-(p-tolyl)maleimide [1631-28-3]. .

Quinacridone and its derivatives

Quinacridone and its derivatives. Gerson, Herman; Santimauro, John Francis; Lerner, Lawrence Robert (Harmon Colors Corp., USA). U.S. US 4064129 20 Dec 1977, 8 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C09B048-00. NCL: 260279000QA. APPLICATION: US 76-724150 17 Sep 1976. DOCUMENT TYPE: Patent CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Quinacridone (I) [1047-16-1] and its 2,9-dimethyl- [980-26-7] and 2,9-dichloro- [3089-17-6] derivs. are prepd. in high purity and yield by heating the corresponding 2,5-bis(arylamino)terephthalic acid in the presence of a sulfonic acid or HClO4 catalyst in a 2-phase liq. system comprising ethylene glycol (II) [107-21-1] and a H2O- and II-immiscible org. solvent at a temp. sufficient to remove the by-product H2O from the reaction by vaporization. Thus, I was prepd. in 94.4% yield by using II-perchloroethylene [127-18-4] solvent system and p-toluenesulfonic acid monohydrate [6192-52-5] as catalyst with 2,5-dianilinoterephthalic acid [10109-95-2] as starting material.