tricyclo<4.3.1.1.3,8>undecan-4,5-dione 、
(2,2-diethoxyvinylidene)triphenylphosphorane 以
乙醚 为溶剂,
反应 2.0h,
以65%的产率得到9,8,18,18-Tetraethoxy-2,3,4,5,6,7,10,11,12,13,14,15,16,18-tetradecahydro-1,5:3,7:10,14:12,16-tetramethano-1H,9H-cyclonona
cyclonona<2,3>pyrano<5,4-d>pyran