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- W2023258529 abstract "Depending upon the degree of ring strain, the thermal breakdown of cis-8-thiabicyclo[4.3.0]non-3-ene 8,8-dioxide 5 and related ring systems in the gas phase follows widely differing pathways. Decomposition of 5 occurs only under forcing conditions, resulting in complete fragmentation of the sulfolane ring to give benzene and toluene, while pyrolysis of the 2,5-bridged analogues 6–8 proceeds by a retro-Diels–Alder reaction at much lower temperatures to give 1,3-dienes and the decomposition products of 3-sulfolene, buta-1,3-diene and SO2. Epoxidation of the double bond in these compounds results in a marked change in their thermal fragmentation behaviour; only SO2 is lost to produce novel divinyl epoxides. The corresponding N-ethoxycarbonylaziridines, formed by photolysis of the unsaturated sulfones in ethyl azidoformate, undergo extensive decomposition on pyrolysis and do not yield any useful products. The saturated sulfone 28 gives the expected octa1, 7-diene upon flash vacuum pyrolysis (FVP), but only under relatively severe conditions. Three isomeric diene sulfones 30–32 have also been examined and show a varied pattern of reactivity under FVP conditions." @default.
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- W2023258529 date "1994-01-01" @default.
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- W2023258529 title "Fragmentation patterns in the gas-phase pyrolysis of some bi- and tri-cyclic sulfolanes related to the 8-thiabicyclo[4.3.0]non-3-ene 8,8-dioxide ring system" @default.
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- W2023258529 doi "https://doi.org/10.1039/p19940002301" @default.
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