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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Crystal structure of pyriproxyfen.

Gihaeng Kang1, Jineun Kim1, Hyunjin Park1

  • 1Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 660-701, Republic of Korea.

Acta Crystallographica. Section E, Crystallographic Communications
|September 24, 2015
PubMed
Summary
This summary is machine-generated.

This study details the molecular structure of a juvenile hormone mimic insecticide. Its crystal structure reveals specific dihedral angles and weak interactions that form a three-dimensional network.

Keywords:
crystal structureetherinsecticidejuvenile hormone mimicpyriproxyfenπ–π stacking

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Insecticide Development

Background:

  • Juvenile hormone mimics are crucial in insect growth regulation and pest control.
  • Understanding the molecular conformation of these compounds is key to optimizing their efficacy.
  • The systematic name of the compound is 4-phen-oxy-phenyl (RS)-2-[(pyridin-2-yl)-oxy]propyl ether (C20H19NO3).

Purpose of the Study:

  • To elucidate the crystal structure and molecular conformation of a novel juvenile hormone mimic insecticide.
  • To investigate the intermolecular interactions present in the crystalline state.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
  • Analysis of dihedral and torsion angles provided insights into the molecular conformation.
  • Identification of intermolecular interactions such as π-π stacking and C-H⋯π interactions.

Main Results:

  • The dihedral angles between the central benzene ring and the pendant pyridine and phenyl rings were determined to be 78.09(6)° and 82.14(8)°, respectively.
  • The O-C-C-O linkage adopted a gauche conformation with a torsion angle of -75.0(2)°.
  • Weak aromatic π-π stacking and C-H⋯π interactions were observed, forming a 3D network.

Conclusions:

  • The determined molecular conformation and intermolecular interactions provide a structural basis for the compound's activity as a juvenile hormone mimic.
  • The crystal packing analysis offers insights into the solid-state properties relevant for formulation and application.
  • This structural data can guide the design of more potent and selective insecticides.