in pentane T=23°C; Irradiation;

T=23°C; Irradiation; Quantum yieldRate constantMechanism;

palladium diacetate; copper(ll) bromide in 1,2-dichloro-ethane T=20°C; 1 h;

1: 1-bromobicyclolt;1.1.0gt;butane With tert.-butyl lithium in diethyl ether T=0°C; Metallation; lithium/bromine exchange; 2 h; 2: With tributyltin chloride T=20°C; transmetalation; 2 h; 3: para-iodoanisole With tetrakis(triphenylphosphine) palladium(0) in N,N-dimethyl-formamide T=65°C; Stille cross-coupling; 24 h;

lithium bromide in N,N-dimethyl-formamide T=75°C; 1 h;

1: 1.) Mg / 1.) ether, 2.) ether, reflux, 5 h 2: benzene / 4 h / Ambient temperature 3: 43 percent / cyclohexane / Irradiation View Scheme

1: 1-bromo-4-methoxy-benzene With n-butyllithium in tetrahydrofuran; hexane T=-78°C; Inert atmosphere; 2: With cerium(III) chloride in tetrahydrofuran; hexane T=-78°C; 1.5 h; Inert atmosphere; 3: cyclobutyl ketone Further stages;

toluene-4-sulfonic acid in benzene 6 h; Heating; Yield given;

T=20°C; Irradiation;

T=20°C; Irradiation;