(E,E,E,E)-<2,7-Dimethyl-9-(2,6,6-trimethylcycloxhex-1-enyl)nona-2,4,6,8-tetraenyl>sulfonylbenzene 、
methyl (Z,E)-4-oxo-2-<2-(2,6,6-trimethylcyclohex-1-enyl)vinyl>but-2-enoate 在
lithium diisopropyl amide 作用下,
生成 5-[(2E,4E,6E,8E)-2,7-Dimethyl-9-(2,6,6-trimethyl-cyclohex-1-enyl)-nona-2,4,6,8-tetraen-(E)-ylidene]-3-[(E)-2-(2,6,6-trimethyl-cyclohex-1-enyl)-vinyl]-5H-furan-2-one