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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
2,6-Di(pyrrolidin-1-yl)pyridinium chloride monohydrate
Abstract:
In the organic cation of the title compound, C(13)H(20)N(3) (+)·Cl(-)·H(2)O, the two pyrrolidine rings adopt twisted conformations. The pyridine ring makes dihedral angles of 14.57 (6) and 23.96 (6)° with the mean planes of the pyrrolidine rings. In the crystal structure, pairs of bifurcated inter-molecular O-H⋯Cl hydrogen bonds link the water mol-ecules and chloride anions into an R(4) (4)(8) ring motif. Inter-molecular N-H⋯Cl, C-H⋯Cl and C-H⋯O hydrogen bonds further inter-connect these rings with the organic cations into a two-dimensional network parallel to the bc plane.
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Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
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