silver(l) oxide in acetonitrile T=90°C; 1.5 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: 1.) ZnBr2, 2.) AgCO3 / 1.) CH2Cl2, 2 h, 2.) 16 h 2: N,N-diethylammoniumsulfur trifluoride / CH2Cl2 / -70 deg C -> room temperature View Scheme

1: 1.) KOH, 2.) pyridine / 1.) EtOH, H2O, 80 deg C, 30 min, 2.) reflux, 2 h 2: 1.) ZnBr2, 2.) AgCO3 / 1.) CH2Cl2, 2 h, 2.) 16 h 3: N,N-diethylammoniumsulfur trifluoride / CH2Cl2 / -70 deg C -> room temperature View Scheme

tin(IV) chloride in dichloromethane 1 h; Molecular sieveInert atmosphere;

mercury(II) cyanide Yield given;