(E)-β-farnesene 、 3-丁炔-2-酮 反应 16.0h,
以to give 1-acetyl-4-(4,8-dimethyl-3,7-nonadienyl)-cyclohex-4-ene as a pale yellow oil (2.3 g, 50%)的产率得到1-Acetyl-4-(4,8-dimethyl-3,7-nonadienyl)-cyclohex-4-ene
Compounds which are .beta.-farnesene derivatives obtainable as a Diels-Adler adduct of .beta.-farnesene and a dienophile or by a modification of such an adduct in a manner as defined herein are of value in pest control, particularly in the control of aphids.