Preparation and Protonation of Tungsten- and Molybdenum-Dinitrogen Complexes Bearing Bis(dialkylphosphinobenzene)chromiums as Auxiliary Ligands

Tungsten- and molybdenum-dinitrogen complexes bearing bis(dialkylphosphinobenzene)chromiums have been prepared and characterized by X-ray crystallography. Reactions of these dinitrogen complexes with an excess amount of sulfuric acid in methanol at room temperature give ammonia in good yields. Stoichiometric reactions of some dinitrogen complexes with 2 equiv of trifluoromethanesulfonic acid afford the corresponding hydrazido complexes, which may be considered to be one of the reactive intermediates.