In the presence of boron trifluoride etherate, the ω-silyloxyallyltrimethylsilanes Me3SiO(CH2)nCH(CHCH2)SiMe3 (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.
在
三氟化硼醚的存在下,ω-silyloxyallyltrimethylsilanes我3的SiO(CH 2)Ñ CH(CHCH 2)森达3(Ñ = 2,3)区域专一性与脂族或芳族醛,但不易与脂族酮反应,通过分子内过程得到不饱和的含氧杂环,例如2-烷基-2,3,6,7-四氢氧杂
环丁烷和2-烷基-2,3,6,7-四氢氧杂
环丁烷。