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Eight- and 16-membered cyanuric-sulfanuric ring systems: C2N4S2-->C2N3S ring contraction
T Chivers1, M P Gibson, M Parvez
1Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4.
Inorganic Chemistry
|January 16, 2003
Summary
New cyanuric-sulfanuric ring systems were synthesized and characterized. Oxidation of sulfur(IV) to sulfur(VI) systems resulted in conformational changes and shorter S-N bonds, with thermolysis yielding a novel six-membered ring.
Area of Science:
- Inorganic Chemistry
- Crystallography
- Organic Synthesis
Background:
- Cyanuric-sulfanuric ring systems are heterocyclic compounds with potential applications in materials science and medicinal chemistry.
- Understanding the structural and conformational properties of these systems is crucial for designing new molecules with tailored functionalities.
Purpose of the Study:
- To synthesize novel eight- and 16-membered cyanuric-sulfanuric ring systems.
- To investigate the structural and conformational changes upon oxidation of sulfur(IV) to sulfur(VI) states.
- To explore the thermal decomposition pathways of these ring systems.
Main Methods:
- Synthesis of eight- and 16-membered cyanuric-sulfanuric rings via oxidation of sulfur(IV) precursors using m-chloroperbenzoic acid.
- X-ray crystallography for detailed structural determination of sulfur(IV) and sulfur(VI) systems, including their conformations and bond distances.
- Thermolysis studies to investigate decomposition pathways, followed by structural confirmation of products using X-ray crystallography.
Main Results:
- Successful synthesis of eight- and 16-membered cyanuric-sulfanuric ring systems in good yields.
- Oxidation to sulfur(VI) resulted in endo positioning of oxygen atoms and altered ring conformations (twist boat for eight-membered, retained cradle for 16-membered).
- Shorter S-N bond distances (approx. 0.06 Å) were observed in sulfur(VI) systems compared to sulfur(IV) counterparts.
- Thermolysis of an eight-membered system yielded a novel six-membered ring via loss of a sulfanuric group.
Conclusions:
- The study demonstrates the successful synthesis and structural characterization of novel cyanuric-sulfanuric ring systems.
- Oxidation significantly influences the conformation and S-N bond lengths within these heterocyclic frameworks.
- The identified thermolysis pathway provides insights into the stability and reactivity of these compounds.