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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

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In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

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The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
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Preparation of 1° Amines: Gabriel Synthesis01:28

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Aminotriazines as Locking Fragments in Macrocyclic Synthesis.

Paul V. Bernhardt1, Elizabeth J. Hayes

  • 1Department of Chemistry, University of Queensland, Brisbane, 4072, Australia.

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Summary

New macrocyclic copper(II) compounds featuring melamine, ammeline, and ammelide rings were synthesized and characterized. Structural analyses revealed tape-like and dimeric assemblies, highlighting their potential for cocrystallization.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Macrocyclic ligands offer versatile platforms for constructing novel coordination complexes.
  • Copper(II) complexes are of interest due to their diverse applications in catalysis and materials science.
  • Triazine-based macrocycles provide unique structural and electronic properties.

Purpose of the Study:

  • To synthesize and characterize novel macrocyclic copper(II) complexes with pendant melamine, ammeline, and ammelide rings.
  • To elucidate the solid-state structures of these complexes using X-ray crystallography.
  • To investigate the self-assembly behavior and potential for cocrystallization of these compounds.

Main Methods:

  • Synthesis of macrocyclic ligands and their copper(II) complexes.
  • X-ray crystallographic analysis to determine molecular and crystal structures.
  • Spectroscopic and analytical techniques for compound characterization.

Main Results:

  • Successful synthesis of three copper(II) macrocyclic compounds with melamine, ammeline, and ammelide moieties.
  • X-ray crystallography revealed distinct supramolecular architectures: linear tapes for the melamine derivative and dimers for the ammeline derivative.
  • Determination of tautomeric forms for the ammeline and ammelide components.

Conclusions:

  • The synthesized macrocyclic copper(II) complexes exhibit diverse self-assembly behaviors in the solid state.
  • The structural diversity arises from the specific triazine substituents and intermolecular interactions like hydrogen bonding and pi-pi stacking.
  • These compounds serve as promising building blocks for the design of advanced crystalline materials through cocrystallization.