1: 1-bromo-4-(trifluoromethoxy)benzene With n-butyllithium in diethyl ether; hexane T=-75°C; 0.75 h; 2: 1-naphthyl cyanate in diethyl ether; hexane T=25°C; 1 h; Further stages.;

1: phenyl trifluoromethyl ether With N,N,N',N,-tetramethylethylenediamine; sec.-butyllithium in tetrahydrofuran; cyclohexane T=-75°C; 2 h; 2: 1-naphthyl cyanate in tetrahydrofuran; cyclohexane T=-75°C; Further stages.;

1: (1-cyclopentene-l-yl-oxy)-trimethylsilane With methyllithium in diethyl ether T=0°C; Inert atmosphere; 2: 1-naphthyl cyanate in ethylene glycol dimethyl ether; diethyl ether T=-70°C; 8 h; Inert atmosphere;

(i) nBuLi, Et2O, THF, PE, (ii) /BRN= 510306/; Multistep reaction;

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