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Updated: Jun 1, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
9,9-Bis[4-(prop-2-yn-yloxy)phen-yl]-9H-fluorene
Abstract:
In the title compound, C(31)H(22)O(2), the bond angle at the C atom belonging to the five-membered ring of the fluorene system is opened to 112.64 (12)°. The two benzene rings are twisted with respect to the fluorene ring system at dihedral angles of 72.81 (6) and 81.83 (6)°. One C(ar-yl)-O-C-C fragment is extended, with a C-O-C-C torsion angle of -178.77 (13)°, but the other C(ar-yl)-O-C-C fragment is bent, with a C-O-C-C torsion angle of 64.78 (19)°. Inter-molecular weak C-H⋯O hydrogen bonding is present in the crystal structure.
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