Palladium- and Platinum-Catalyzed Reactions of Silacyclobutanes with Acid Chlorides Affording Cyclic Silyl Enol Ethers and/or 3-(Chlorosilyl)propyl Ketones

Palladium and platinum complexes catalyze the reaction of silacyclobutanes with acid chlorides in the presence of a large excess of a tertiary amine (triethylamine, diisopropylethylamine) at higher temperatures (∼80 °C) to give cyclic silyl enol ethers, 1-sila-2-oxa-3-cyclohexenes, in excellent yields, while the reaction in the presence of a limited quantity of the amine at room temperature forms 3-(chlorosilyl)propyl ketones in good yields.