24407-32-7Relevant articles and documents
Synthesis of N-unsubstituted cyclic imides from anhydride with urea in deep eutectic solvent (DES) choline chloride/urea
Liu, Luxiao,Zhang, Hong-Yu,Yin, Guohui,Zhang, Yuecheng,Zhao, Jiquan
, p. 1351 - 1357 (2019/11/19)
N-Unsubstituted cyclic imides were readily synthesized in deep eutectic solvent (DES) choline chloride (ChCl)/urea from anhydrides with urea. Urea serves as both a DES component and a nitrogen source, which endows the protocol with advantages of smooth reaction, easy separation of products, simple recovery and recycling of ChCl/urea.
An expedient and convenient approach for one-pot synthesis of 1H-isoindole-1,3(2H)-diones
Ekhtiari, Zeinab,Havasi, Forugh,Nikpour, Farzad
, p. 941 - 944 (2016/10/13)
An easy and expedient method for the one-pot synthesis of 1H-isoindole-1,3(2H)-diones has been developed by the reaction of the corresponding cyclic anhydrides with guanidinium chloride as a nitrogen source in the presence of FeCl3 as a catalyst under mild reaction conditions.
Benzocyclobutenes. Part 4. Synthesis of Benzocyclobutene-1,2-diones by Pyrolytic Methods
Gould, Ken J.,Hacker, Nigel P.,McOmie, John F. W.,Perry, David H.
, p. 1834 - 1840 (2007/10/02)
Oxidation of the cyclic hydrazides prepared from phthalic anhydrides in the presence of anthracene gives the corresponding Diels-Alder adducts which, on flash vacuum pyrolysis, give benzocyclobutene-1,2-dione (BBD) and its 4-chloro, 3,6- and 4,5-dichloro, 4,5-dibromo, and 4,5-dimethyl derivatives in 75-98percent yield.Cyclobuta- and cyclobuta-naphthalene-1,2-dione as well as cyclobuta- and cyclobuta-pyridine-1,2-dione have been prepared similarly; the last three of these diones are very unstable.Cyclobutanaphthalene-1,2-dione has also been made by pyrolysis of benzindene-1,2,3-trione.Attempts to make thiophen and furan analogues of BBD from appropriate anthracene adducts failed as did attempts to make tetrachloro- and tetrabromo-derivatives of BBD by the pyrolysis of tetrahalogenophthalimidosulphoximides.