Journal article
Sydnone Photochemistry: Direct Observation of Earl's Bicyclic Lactone Valence Isomers (Oxadiazabicyclo[2.1.0]pentanones), Formation of Carbodiimides, Reaction Mechanism, and Photochromism
Australian Journal of Chemistry, Vol.67(3), pp.457-468
2014
Abstract
The matrix photolyses of 3-phenyl-, 3-pyridyl, and 3,4-diphenylsydnones 16, 19, and 22 were investigated by matrix-isolation infrared spectroscopy. The formation of the neutral, bicyclic lactone valence isomers postulated by Earl – the oxadiazabicyclo[2.1.0]pentanones exo-17 and exo-20 – was clearly observed in the first two cases and is also likely in the case of exo-23 (C=O absorptions in the IR at 1881, 1886, and 1874 cm–1, respectively). The efficient photodecomposition of sydnones to carbodiimides RN=C=NR′ (18, 21, and 24) and CO2 was established in all three cases. The formation of benzonitrile 27 and azacycloheptatetraene 29 in the matrix photolysis of diphenylsydnone 22 is indicative of diphenylnitrile imine PhCNNPh 26 as an intermediate (2340 cm–1). Neither bicyclic lactones nor carbodiimides have been observed previously in sydnone photochemistry. A general reaction mechanism for the formation of carbodiimides, nitrile imines, and photochromism is put forward.
Details
- Title
- Sydnone Photochemistry: Direct Observation of Earl's Bicyclic Lactone Valence Isomers (Oxadiazabicyclo[2.1.0]pentanones), Formation of Carbodiimides, Reaction Mechanism, and Photochromism
- Authors/Creators
- R.N. Veedu (Author/Creator) - The University of QueenslandD. Kvaskoff (Author/Creator) - The University of QueenslandC. Wentrup (Author/Creator) - The University of Queensland
- Publication Details
- Australian Journal of Chemistry, Vol.67(3), pp.457-468
- Publisher
- Commonwealth Scientific and Industrial Research Organization Publishing
- Identifiers
- 991005539988507891
- Copyright
- © 2014 CSIRO
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 2 Chemistry
- 2.1 Synthesis
- 2.1.549 Bioactive Heterocycles
- Web Of Science research areas
- Chemistry, Multidisciplinary
- ESI research areas
- Chemistry