title: 5-Chloro-1-[(E)-3-(dimethyl-amino)-acrylo-yl]-3-methyl-1H-benzimidazol-2(3H)-one-6-chloro-1-[(E)-3-(dimethyl-amino)-acrylo-yl]-3-methyl-1H-benzimid-azol-2(3H)-one (4/1).
abstract: In the reaction of 7-chloro-1,5-benzodiazepine-2,4-dione with N,N-dimethyl-formamide/dimethyl-acetal, the diazepine seven-membered ring undergoes a contraction to form the five-membered ring. The reaction yields two isomers the title compound, C(13)H(14)ClN(3)O(2); the major component has the chlorine-atom substituent in the 5-position of the benzimidazolone ring and the minor component has the chlorine atom in the 6-position. The two isomers form a disordered co-crystal, the chloro-methyl-benzimidazolone portion of both components are disordered with respect to each other in a 4:1 ratio [the refined ratio is 0.816 (5):0.184 (5)]; the dimethyl-amino-cryloyl substitutent is ordered. The double bond of the dimethyl-amino-acryloyl substituent has an E configuration.
authors.forename: Rachida
authors.initials: R
authors.lastname: Dardouri
authors.forename: Yousef Kandri
authors.initials: YK
authors.lastname: Rodi
authors.forename: Natalie
authors.initials: N
authors.lastname: Saffon
authors.forename: El Mokhtar
authors.initials: el M
authors.lastname: Essassi
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng