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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
Published on: November 22, 2016
Phosphazene vs.diazaphospholene PN-bond cleavage in spirocyclic cyclodiphosphazenes
Sebastian Burck1, Dietrich Gudat, Martin Nieger
1Section Organic and Inorganic Chemistry, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV, Amsterdam, the Netherlands.
Dalton Transactions (Cambridge, England : 2003)
|June 27, 2008
Summary
Thermolysis of 2-azido-1,3,2-diazaphospholenes yields rare spirocyclic cyclodiphosphazenes. These compounds exhibit unique reactivity and stability, including molecular recognition and N-protonation, offering new avenues in phosphorus chemistry.
Area of Science:
- * Inorganic Chemistry
- * Organophosphorus Chemistry
- * Materials Science
Background:
- * 2-azido-1,3,2-diazaphospholenes are precursors to novel phosphorus-nitrogen compounds.
- * Spirocyclic cyclodiphosphazenes are rare and possess unique structural and electronic properties.
- * Understanding the stability and reactivity of these compounds is crucial for synthetic applications.
Purpose of the Study:
- * To explore the thermolysis of 2-azido-1,3,2-diazaphospholenes.
- * To characterize the resulting spirocyclic cyclodiphosphazenes using spectroscopic and crystallographic methods.
- * To investigate the reactivity and degradation pathways of these novel compounds.
Main Methods:
- * Thermolysis reactions.
- * Nuclear Magnetic Resonance (NMR) spectroscopy.
- * Mass spectrometry (MS).
- * X-ray diffractometry.
- * Electrospray ionization Fourier-transform ion cyclotron resonance (ESI-FT-ICR) studies.
- * Chemical reaction studies (N-protonation, hydrolytic degradation).
Main Results:
- * Successful synthesis of novel spirocyclic cyclodiphosphazenes via thermolysis.
- * Characterization revealing an ionic bonding situation contributing to thermal stability.
- * Demonstration of reductive elimination and symmetrical cleavage pathways via ESI-FT-ICR.
- * Observation of unexpected benzene inclusion, suggesting molecular recognition.
- * Proof of double N-protonation and selective hydrolytic P-N bond cleavage.
Conclusions:
- * Thermolysis is an effective route to rare spirocyclic cyclodiphosphazenes.
- * The compounds display significant thermal stability attributed to ionic bonding.
- * These cyclodiphosphazenes exhibit diverse reactivity, including ring cleavage and protonation.
- * Molecular recognition plays a role in their crystal packing.
- * The findings expand the scope of phosphorus-nitrogen chemistry and potential applications.
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