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Updated: May 17, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Methyl (3R*,3'S*)-1',1''-dimethyl-2,2''-dioxodispiro-[indoline-3,2'-pyrrolidine-3',3''-indoline]-4'-carboxyl-ate
G Ganesh1, Panneer Selvam Yuvaraj, E Govindan
1Department of Physics, S.M.K. Fomra Institute of Technology, Thaiyur, Chennai 603 103, India.
Abstract:
In the title compound, C(22)H(21)N(3)O(4), the central pyrrolidine ring adopts an envelope conformation with the N atom in the flap position. The indoline ring systems are almost perpendic-ular to the mean plane of the pyrrolidine ring, making dihedral angles of 86.4 (8) and 83.1 (8)°. The acetate group attached to the pyrrolidine ring assumes an extended conformation. In thecrystal, N-H⋯O hydrogen bonds result in the formation of a C(7) chain running along [100]. The crystal packing also features π-π inter-actions [centroid-centroid distance = 3.2032 (11) Å].
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