thionyl chloride in pyridine Ambient temperature;

1: phenyllithium; α-bromo-(1,1,3,3-tetramethyl-2-indanylidene)methane in diethyl ether T=22°C; 0.333333 h; 2: carbon dioxide in diethyl ether 44 h; Further stages.;

1: 1.) Bromine, Mg / 1.) Ether, 2.) THF, 15 h, reflux 2: 95 percent / SOCl2 / pyridine / Ambient temperature View Scheme

1: 1.) Bromine, Mg / 1.) Ether, 2.) THF, 15 h, reflux 2: 95 percent / SOCl2 / pyridine / Ambient temperature View Scheme

1: acetic anhydride; dihydrogen peroxide / acetic acid / 20 °C 2: n-butyllithium / hexane; tetrahydrofuran / 3.5 h / -50 - 20 °C / |Inert atmosphere 3: |Acidic conditions 4: 2,2,2-tribromo-2,2-dihydrobenzo-1,3,2-dioxaphosphole / dichloromethane / 47 °C / |Inert atmosphere View Scheme

1: acetic anhydride; dihydrogen peroxide / acetic acid / 20 °C 2: pyridin-2-yl hydrobromide / 1,2-dichloro-ethane / 100 °C View Scheme