title: 4-Acetyl-1H-pyrrole-2-carbaldehyde.
abstract: The title compound, C(7)H(7)NO(2), was synthesized via a one-pot Vilsmeier-Haack and subsequent Friedel-Crafts reaction. The pyrazole ring makes dihedral angles of 4.50 (9) and 2.06 (8)°, respectively, with the aldehyde and acetyl groups. In the crystal, classical N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions assemble the mol-ecules into a chain along the b axis.
authors.affiliation: Taishan Medical University, Tai'an 271016,  People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Sun
authors.forename: Jia-Wei
authors.initials: JW
authors.lastname: Xie
authors.forename: Ren-Ying
authors.initials: RY
authors.lastname: Zhao
authors.forename: Ai-Guo
authors.initials: AG
authors.lastname: Zhu
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Ge