1: 1,3,3-trimethyl-2-[(2E,4E,6E)-3,7-dimethyl-2,4,6,8-nonatetraenyl]cyclohexene With NMPA; lithium diisopropyl amide in tetrahydrofuran; hexane 2: With sodium hydroxide; fluorodimethoxyborane*Et2O in tetrahydrofuran T=25°C; 2 h; 3: acetyl chloride With pyridine in dichloromethane T=25°C; 3 h; Further stages.;