25,26-dimethoxy-3,4,5,9,23-pentamethyl-13,16,19-trioxa-27-oxoniatetracyclo<19.3.1.1.1>heptacosa-1(25),2,4,6(27),7,9,11(26),21,23-nonane tetrafluoroborate 在
吡啶 、
原甲酸三乙酯 作用下,
以
溶剂黄146 为溶剂,
反应 0.5h,
以61%的产率得到4-<<3-<25,26-dimethoxy-3,5,9,23-tetramethyl-13,16,19,27-tetraoxatetracyclo<19.3.1.1.1>heptacosa-1(25),2,5,7,9,11(26),21,23-octaen-4-ylidene>-1-propenyl>>-25,26-dimethoxy-3,5,9,23-tetramethyl-13,16,19-trioxa-27-oxoniatetracyclo<19.3.1.1.1>heptacosa-1(25)