T=660°C; P=0.2 Torr;

1: 63 percent / MeTi(OiPr)3; cHexMgBr / tetrahydrofuran; diethyl ether / 20 °C 2: 90 percent / decahydronaphthalene / 1 h / 220 °C 3: H2O2 / 48 h / 20 °C 4: H2O / 150 °C / 1 Torr View Scheme

hydrogenchloride in diethyl ether 4 h; Heating;

n-butyllithium; chloro-trimethyl-silane; ammonium chloride in tetrahydrofuran; dichloromethane; Petroleum ether Ar; nBuLi, diene, petroleum ether, -10°C; stirring, room temp.; ppt. dissolved in THF; Me3SiCl in THF added; stirring, room temp., 6 h; aq. NH4Cl added, 0°C; extd. with Et2O; evapn.; dissolved in CH2Cl2; TiCl4/CH2Cl2 added, stirring; solvent removed under vac., residue washed with petroleum ether, dried; elem. anal.;