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Updated: May 22, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
1-(2-Hy-droxy-eth-yl)pyrrole-2,5-dione
Xue-Jie Tan1, Ting-Wen Du, Dian-Xiang Xing
1School of Chemical and Pharmaceutical Engineering, Shandong Institute of Light Industry, Jinan 250353, People's Republic of China.
Abstract:
The asymmetric unit of the title compound, C(6)H(7)NO(3), contains two mol-ecules (A and B) related by a non-crystallographic twofold pseudo-axis. The mol-ecules are joined in the (AABB)(n) manner by O-H⋯O hydrogen bonds between their hy-droxy groups, thus forming C(2) chains along the a-axis direction. Neighboring mol-ecules of the same kind (A and A, or B and B) are related by inversion centers, so that all hy-droxy H atoms are disordered other two sets of sites with half occupancies (superimposed O-H⋯O and O⋯H-O fragments). The mol-ecules are further linked by C-H⋯O inter-actions, which can be considered to be weak hydrogen bonds.
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