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- W2100066941 abstract "Photolyses of 2,3-bis(trimethylsilyl)-substituted methylenecyclobutenones 22−26 give essentially quantitative conversion to the allenylketenes 28−32 which have been isolated as long-lived species at room temperature. As predicted by molecular orbital calculations, the methylenecyclobutenones 22 and 26, with carbethoxy and hydrogen substitution on the methylene group, respectively, undergo thermal equilibration with the corresponding allenylketenes 28 and 32 with equilibrium constants [22]/[28] = 1.0 and [26]/[32] = 0.029, at 100 °C. The X-ray structure of the phenyl-substituted allenylketene 29 confirms the anti-planar conformation as predicted by calculation. The bis(allenylketene) 35 has been made by an analogous procedure. Hydration rates of the allenylketenes show acceleration by the CO2Et substituent, but in all cases these are modestly less reactive than the 1,2-bisketene (Me3SiCCO)2." @default.
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- W2100066941 date "2010-08-03" @default.
- W2100066941 modified "2023-09-25" @default.
- W2100066941 title "ChemInform Abstract: Stabilized and Persistent Allenylketenes." @default.
- W2100066941 cites W2949328780 @default.
- W2100066941 doi "https://doi.org/10.1002/chin.199725063" @default.
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