Acylarylnitrosamines. Part V. Decompositions of N-nitrosobenzanilides in carbon tetrachloride and benzene: the formation of carboxylic acids, anhydrides, and arynes
作者:J. I. G. Cadogan、D. M. Smith、J. B. Thomson
DOI:10.1039/p19720001296
日期:——
Reactions carried out in the presence of tetraphenylcyclopentadienone lead to the trapping of arynes, with suppression, in some cases, of formation of the anhydride. The presence of water leads to the suppression of the formation of arynes. Similar results are obtained from corresponding decompositions in benzene with the exception that anhydrides are not formed. 2′,4,6′-Trichloro- and 2′,4′,6′-t
一系列的分解Ñ -nitrosobenzanilides [R 1 C ^ 6 ħ 4 ·N(NO)·CO·C 6 H ^ 4 - [R 2 - p ; R 2= Cl;R 1= H,2-Br,3-Br,4-Br,3-Me,4-Me,3-NO 2或4-NO 2。R 2= Br;R 1 = 4-NO 2或4-Me。R 1= H;研究了在四氯化碳中存在或不存在四苯基环戊二烯酮的情况下的R 2 = NO 2或Me]。在后一种情况下,反应生成相应的苯甲酸(p -R 2 C 6 H 4 ·CO 2 H)(29–79%),苯甲酸酐[(p -R 2 C 6 H 4 ·CO)2 O](12–38%)和芳基氯(R 1 C 6高4Cl)(15–40%)为主要产物,因此表明已经发生了芳族质子的去除,并且亚硝酸酰胺或重氮羧酸异构体上的羧酸根阴离子已经发生了进攻。在四苯基环戊二烯酮存在下进行的反应导致捕获芳烃,在某
WAISSER, KAREL;HOUNGBEDJI, NESTOR;MACHACEK, MILOS;SEKERA, MIROSLAV;URBAN,+, COLLECT. CZECHOSL. CHEM. COMMUN., 55,(1990) N, C. 307-316
A mild, metal-free, and absolutely para-selective bromination of aniline derivatives has been developed in excellent yields, wherein the organic dye Eosin Y is employed as the bromine source in company with Selectfluor. Neither air nor moisture sensitive, this facile reaction proceeds smoothly at room temperature and completes within a short time. Mechanistic studies indicate a radical pathway; therefore