title: 2,2,10-Trimethyl-2,3-dihydro-pyrano[2,3-a]carbazol-4(11H)-one.
abstract: The title compound, C(18)H(17)NO(2), was prepared from 1-hydr-oxy-8-methyl-carbazole and 3,3-dimethyl-acrylic acid with trifluoro-acetic acid as the cyclization catalyst. Due to the -CMe(2)- group, the mol-ecule is not quite planar. The packing is dominated by the strong N-H⋯O hydrogen bonds and some weaker C-H⋯O and C-H⋯π inter-actions. π-π Stacking inter-actions [centroid-centroid separation = 3.806 (2) Å] join neighboring mol-ecules into loosely connected inversion dimers.
authors.forename: Makuteswaran
authors.initials: M
authors.lastname: Sridharan
authors.forename: Karnam J Rajendra
authors.initials: KJ
authors.lastname: Prasad
authors.forename: Aimable
authors.initials: A
authors.lastname: Ngendahimana
authors.forename: Matthias
authors.initials: M
authors.lastname: Zeller