Abstract
In the presence of boron trifluoride etherate, the ω-silyloxyallyltrimethylsilanes Me 3SiO(CH 2) n CH(CHCH 2)SiMe 3 ( n = 2, 3) regiospecifically react with aliphatic or aromatic aldehydes but less readily with aliphatic ketones, to give unsaturated oxygen-containing heterocycles, such as 2-alkyl-2,3,6,7-tetrahydrooxepines and 2-alkyl-2,3,6,7-tetrahydrooxocins, by an intramolecular process.
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