sodium dithionite; potassium carbonate; N,N'-dioctyl-4,4'-bipyridinium in water; acetonitrile T=35°C; 24 h;

sodium dithionite; potassium carbonate; N,N'-dioctyl-4,4'-bipyridinium in water; acetonitrile T=35°C; 2 h; Yield given. Yields of byproduct given;