Abstract
A new approach to the direct synthesis of ketones from alkanes or cycloalkanes (RH), CO, and silanes is proposed. Ketones were obtained in 50–97% yields from propane, butane, cyclopentane, cyclohexane, and methylcyclopentane on treatment with CO and silanes (Me4Si, Et4Si, orm- andp-XC6H4SiMe3, where X=Cl, Me, OMe) in the presence of CX4·2AlBr3 (X=Br, Cl) superacids at 0°C. The reactions withm- andp-XC6H4SiMe3 (X=Cl, Me) occur regioselectively to givem-ketones fromm-silanes andp-ketones fromp-silanes. However, the only product,p-MeOC6H4COR, is formed both fromm- andp-MeOC6H4SiMe3. The reaction ofcyclo-C5H9CO+ with BzSiMe3 results in an organosilicon ketone, Me3SiCH2C6H4COC5H9, while in the presence of an excess of an acylating system (after alcoholysis), Me2Si(OR′)CH2C6H4COR is formed.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 947–952, May, 1998.
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Akhrem, I.S., Churilova, I.M., Orlinkov, A.V. et al. A new efficient and selective synthesis of ketones from alkanes or cycloalkanes, CO, and silanes in the presences of aprotic superacids. Russ Chem Bull 47, 918–923 (1998). https://doi.org/10.1007/BF02498161
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DOI: https://doi.org/10.1007/BF02498161