Titanium Hydrazinediido Half-Sandwich Complexes: Highly Active Catalysts for the Hydrohydrazination of Terminal Alkynes at Ambient Temperature

Reaction of [Cp*Ti((NN)-N-Xyl)((NBu)-Bu-t)((NH2Bu)-Bu-t)] with 1 molar equiv of diphenylhydrazine yielded the hydrazinediido complex [Cp*Ti((NN)-N-Xyl)(NNPh2)((NH2Bu)-Bu-t)] (1a), whereas the orange pyridine adduct [Cp*Ti((NN)-N-Xyl)(NNPh2)(py) (1b) was obtained by reacting the imide jCp*Ti((NN)-N-Xyl)((NBu)-Bu-t)((NH2Bu)-Bu-t)] with diphenylhydrazine in the presence of pyridine. The tert-butylamine coordinated to the metal center in la could be removed by heating the solid at 60 degrees C and 10(-6) mbar for 72 h, yielding [Cp*Ti((NN)-N-Xyl)(NNPh2)] (1c). In the presence of pyridine or 4-dimethylaminopyridine (dmap) as neutral co-ligands the hydrazinediido complexes [Cp*Ti((NN)-N-Xyl)(NNMePh)(py)] (2a) and [Cp*Ti((NN)-N-Xyl)(NNMePh)(dmap)] (2b) as well as [Cp*Ti((NN)-N-Xyl)(NNMe2)(dmap)] (3) were prepared. Upon replacement of dmap by the weaker donor ligand pyridine in the synthesis of the pyridine adduct analogous to 3, a mixture of [Cp*Ti((NN)-N-Xyl)(NNMe2))(py)] (4a) and the dinuclear complex [Cp*Ti-2(2)((NN)-N-Xyl)(2)(mu-eta(1),eta(2)-NNMe2)(mu-eta(1),eta(2)- NNMe2)] (4b) was obtained. Reaction of the dirnethylhydrazinediido complex 3 with phenylacetylene gave the Markovnikov cycloadduct, which had sufficient lifetime to allow its H-1, C-13, and N-15 NMR spectroscopic characterization in solution. All three hydrazinediido compounds la, 2a, and 3 were found to display remarkable activities in catalytic hydrohydrazinations at ambient temperatures. For catalyst loadings of 5 mol % complete conversions of the terminal alkynes and diynes with Markovnikov regioselectivities of over 99% selectivity were observed within 1 h.