Aromatic substitution. 56. Observation of aluminum trichloride-catalyzed trialkylsilylation of benzene and toluene with chlorotrialkylsilanes in the presence of Huenig bases

摘要: The authors now report observation of the direct silylation benzene and toluene with a series chlorotrialkylsilanes under Friedel-Crafts conditions in presence Huenig bases (hindered tertiary amines) as proton acceptors. When excess or was heated chlorotrialkylsilane aluminum trichloride diisopropylethylamine at 150{degree}C sealed heavy walled glass tube for 24 h, corresponding aryltrialkylsilanes were obtained low, but detactable amounts.