The first binuclear rare-earth tetrahydride complexes [(NCN)LnH2]2(THF)3 (1-Ln; LnY, Lu; NCNPhC(NC6H3iPr2-2,6)2) bearing both terminal and bridging hydride ligands were obtained by hydrogenolysis of the dialkyl precursors. These novel binuclear hydride complexes underwent unique Ln-H addition reactions with various unsaturated compounds such as 2,6-dimethylphenyl isocyanide, diphenylacetylene and 1,4-diphenyl-1,3-butadiyne.
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