ABSTRACT
The title compound, C(17)H(15)NO(2), was prepared as one of two products of the AlCl(3)/POCl(3)-catalysed reaction of 9-carbazol-1-ol with 3,3-dimethyacrylic acid. It crystallizes with two crystallographically independent mol-ecules, A and B, which are virtually superimposable but not related by any translational or other pseudosymmetry. Both independent mol-ecules are almost planar [r.m.s. deviations from planarity = 0.053â (1) and 0.079â (1)â Å in A and B, respectively] and contain an intramolecular O-Hâ¯O hydrogen bond. Each type of mol-ecules is connected via pairs of N-Hâ¯O hydrogen bonds, forming centrosymmetric A(2) and B(2) dimers which are, in turn, arranged in offset π-stacks extending along the a-axis direction. The offset of the dimers and the tilt angle of the mol-ecules allows the formation of alternating C-Hâ¯π inter-actions between A and B mol-ecules of parallel stacks.
ABSTRACT
The title compound, C(14)H(15)NO, was synthesized from 2-hydroxy-methyl-enecyclo-hepta-none via a Japp-Klingemann acid-catalyzed cyclization. The seven-membered ring exhibits a slightly distorted envelope conformation. N-Hâ¯O hydrogen bonds form a centrosymmetric dimer; C-Hâ¯O hydrogen bonds and π-π stacking inter-actions (the centers of the atoms involved in the stacking interaction are separated by 3.504â Å) give rise to another type of centrosymmetric dimer. In combination, these inter-actions create a stair-like chain of mol-ecules that inter-acts only loosely with neighboring chains via van der Waals inter-actions and weak C-Hâ¯π contacts.
ABSTRACT
The title compound, C(17)H(15)NO(2), was prepared from 1-hydroxy-carbazole and 3,3-dimethyl-acrylic acid with a mixture of AlCl(3) and POCl(3) as the cyclization catalyst. Owing to the presence of the -CMe(2)- group, the mol-ecule is not quite planar. In the crystal structre, strong N-Hâ¯O hydrogen bonds and weaker C-Hâ¯π inter-actions occur, and a slipped π-π stacking inter-action [centroid-centroid separation = 3.8425â (8)â Å] is also observed.
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-Hâ¯O hydrogen bonds and some weaker C-Hâ¯O and C-Hâ¯π inter-actions. π-π Stacking inter-actions [centroid-centroid separation = 3.806â (2)â Å] join neighboring mol-ecules into loosely connected inversion dimers.