in N,N-dimethyl-formamide T=90°C; 24 h; Inert atmosphereSchlenk technique;

1: 4-methoxy-phenol With potassium tert-butylate in tetrahydrofuran T=0°C; 0.25 h; 2: bis(4-methoxyphenyl)iodonium trifluoromethanesulfonate in tetrahydrofuran T=40°C; 0.833333 h;