5-(2,6,6-trimethylcyclohexenyl)-3-methyl-2,4-pentadienyltriphenylphosphonium bromide 、
2-methyl-3-[3-(1-methyl-2-oxoethylidene)-cyclohex-1-enyl]-propenal 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 1.0h,
以40%的产率得到2-[(1E,3E,5E,7E)-3,7-dimethyl-8-[(3E)-3-[(3E,5E,7E)-6-methyl-8-(2,6,6-trimethylcyclohexen-1-yl)octa-3,5,7-trien-2-ylidene]cyclohexen-1-yl]octa-1,3,5,7-tetraenyl]-1,3,3-trimethylcyclohexene