title: Crystal structure of ethyl 2-[(4-bromo-phen-yl)amino]-3,4-di-methyl-pent-3-enoate.
abstract: In the title compound, C15H20BrNO2, there are two independent mol-ecules (A and B) comprising the asymmetric unit and these adopt very similar conformations. In A, the dihedral angle between the CO2 and MeC=CMe2 groups is 80.7 (3)°, and these make dihedral angles of 3.5 (3) and 84.09 (16)°, respectively, with the bromo-benzene ring. The equivalent dihedral angles for mol-ecule B are 78.4 (3), 2.1 (3) and 78.37 (12)°, respectively. The most prominent inter-actions in the crystal packing are amine-N-H⋯O(carbon-yl) hydrogen bonds between the two independent mol-ecules, resulting in non-centrosymmetric ten-membered {⋯OC2NH}2 synthons. Statistical disorder is noted for each of the terminal methyl groups of the ethyl residues.
authors.affiliation: Departmento de Química, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: Julio
authors.initials: J
authors.lastname: Zukerman-Schpector
authors.affiliation: Departmento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: I
authors.initials: I
authors.lastname: Caracelli
authors.affiliation: Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo-SP, Brazil.
authors.forename: Hélio A
authors.initials: HA
authors.lastname: Stefani
authors.affiliation: Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo-SP, Brazil.
authors.forename: Amna N
authors.initials: AN
authors.lastname: Khan
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink
keywords: amine; crystal structure; hydrogen bonding