... Hence, successful reactions were carried out using either less polar solvents like di-n-butyl ether (Table [1] , entries 1, 5) or without solvent (Table [1] , entries 2-4, 6-8). In addition to the synthesis of simple di(1-adamantyl ... Entry, Salt, Phosphine, Yield (%), 31 P NMR (C 6 D 6 ...