carbonyl group of 6,8-dioxabicyclo[3.2.1]octan-4-one or 7,9-dioxatricyclo[4.2.1.02,4]nonan-5-one, saturated derivatives of levoglucosenone, to form the corresponding stereoisomeric oxaspiropentanes. In the case of the strained tricyclononane, 5R-isomer isomerizes under the reaction conditions into spiro-fused cyclobutanone. For this ketone, the formation of homologation products, i.e., the respective
重氮
环丙烷攻击
左旋葡萄糖酮的饱和衍
生物 6,8-二氧杂双环 [3.2.1]octan-4-one 或 7,9-二氧杂
三环 [4.2.1.02,4]nonan-5-one 的羰基,形成相应的立体异构体氧杂
环戊烷。在应变三
环壬烷的情况下,5R-异构体在反应条件下异构化为螺稠
环丁酮。对于该酮,形成同系化产物,即相应的区域异构体螺-[8,10-二氧杂
三环[5.2.1.02,4]
癸烷-6(5),1'-
环丙烷]-5(6)-ones,也被观察到。