1: (e)-3-methyl-2-(2',6',6'-trimethylcyclohexenyl)-penta-1,3-diene With n-butyllithium; potassium tert-butylate in hexane T=25°C; 1 h; 2: 2,7-dimethyl-octa-2,4,6-triene-1,8-dial in hexane T=-75 - 25°C; 3: With (methoxycarbonylsulfamoyl)-triethyl-ammonium hydroxide in hexane T=25°C; Burgess elimination; 1 h; Further stages.;

1: With n-butyllithium; potassium tert-butylate in hexane T=25°C; 1 h; 2: With sodium hydroxide; fluorodimethoxyborane*Et2O in hexane T=25°C; 1 h; Further stages.;