are described. Some new silylating reagents (oligosilyl bistriflates), which were generated in situ from readily available phenylsilanes, resulted in 5,6-O-(glucofuranose) and 4,5-0-bridged (fructopyranose) carbohydrates with favoured seven- and eight-membered rings. In these cyclic oligosilyl diethers, three and four ring atoms, respectively, are Si atoms. It is noteworthy, that the seven-membered ring
描述了使用庞大的低聚甲
硅烷基团的 1,2-O-异丙叉基-α-D-
呋喃葡萄糖和 1,2-0-异丙叉叉基-β-D-
吡喃
果糖的区域选择性一锅 O-甲
硅烷基化反应。一些新的甲
硅烷基化试剂(低聚甲
硅烷基双
三氟甲磺酸酯)由现成的苯基
硅烷原位生成,可生成 5,6-O-(
呋喃葡萄糖)和 4,5-0-桥接(
吡喃
果糖)
碳水化合物,具有受欢迎的七元和八元戒指。在这些环状低聚甲
硅烷基
二醚中,三个和四个环原子分别是Si原子。值得注意的是,5,6-O-[2,4-bis(trimethylsilyl)-1,1,1,3,3,5,5,5-octamethylpentasilan-2,4-diyl 的七元环]-1,2-O-异亚丙基-aD-
呋喃葡萄糖通过将空气氧区域选择性插入到Si-Si键之一中而扩展为八元环。介绍了一些衍
生物的 X 射线分析。