1: 1,3-dihydro-1-oxo-2H-indene With sodium hexamethyldisilazane in tetrahydrofuran T=-75°C; 0.333333 h; 2: ethyl bromoacetate in tetrahydrofuran T=-75 - -10°C; 4 h;

1,4,8,11-tetraazacyclotetradecane based Ni(II); tetraethylammonium p-toluenesulfonate in N,N-dimethyl-formamide T=60°C; Electrolysis;

Ni(tet a)(ClO4)2; tetraethylammonium p-toluenesulfonate; bis-diphenylphosphine in N,N-dimethyl-formamide T=60°C; Electrolysis;

in N,N-dimethyl-formamide T=160°C;

1: toluene-4-sulfonic acid / benzene / 7 h / |Reflux 2: Grubb's 2nd generation catalyst / dichloromethane / 11.5 h / 20 °C 3: 2-mesityl-2,5,6,7-tetrahydropyrrolo[2,1-c][1,2,4]triazol-4-ium chloride; triethylamine / toluene / 80 °C View Scheme

1: Grubb's 2nd generation catalyst / dichloromethane / 11.5 h / 20 °C 2: 2-mesityl-2,5,6,7-tetrahydropyrrolo[2,1-c][1,2,4]triazol-4-ium chloride; triethylamine / toluene / 80 °C View Scheme

1: sodium carbonate; bis-triphenylphosphine-palladium(II) chloride / tetrahydrofuran; water / 8 h / 80 °C 2: toluene-4-sulfonic acid / benzene / 7 h / |Reflux 3: Grubb's 2nd generation catalyst / dichloromethane / 11.5 h / 20 °C 4: 2-mesityl-2,5,6,7-tetrahydropyrrolo[2,1-c][1,2,4]triazol-4-ium chloride; triethylamine / toluene / 80 °C View Scheme

1.1: ozone / dichloromethane / 7 h / -78 °C 2.1: dichloromethane 2.2: |Inert atmosphere View Scheme

1: in dichloromethane Wittig Olefination; 2: With 2-pentafluorophenyl-6,17dihydro-5H-pyrrolo[2,1-c][1,2,4]triazol-2-ium tetrafluoroborate; triethylamine in tetrahydrofuran Stetter 1,4-Dicarbonyl Synthesis; Inert atmosphere;

lithium aluminium tetrahydride in tetrahydrofuran Heating;