Organolanthanide complexes dimerization

Organolanthanide complexes are known to be highly active catalysts for a variety of organic transformations, which can be either intramolecular or intermolecular in character. Successful intramolecular transformations include hydroelementation processes, which is the addition of a H-E (E = N, O, P, Si, S, H) bond across unsaturated C-C bonds, such as hydroamination, hydroalkoxylation, and hydrophosphination. Intermolecular transformations include a series of asymmetric syntheses, the amidation of aldehydes with amines, Tishchenko reaction, addition of amines to nitriles, aUcyne dimerization, and guanylation of terminal aUcynes, amines, and phosphines with carbodiimides. 

The first organolanthanide hydrogenolysis reaction described in the literature involved the reaction of the dimeric methyl bridged complex, [(CH3C5H4)2Yb(/t-CH3)]2, with H2 in toluene (43). The reaction was... 

Evans, W.J., Meadows, J.H., Wayda, A.L. et al. (1982). Synthesis and X-ray crystallographic characterization of dimeric organolanthanide and organoyttrium hydride complexes. Journal of the American Chemical Society, 104, 2008. 

Yasuda reported some classes of organolanthanide(III) complexes that efficiently initiate stereoregular polymerization of MMA [118,124]. In their first report, they employed samarocene hydride dimer, [SmH(C5Me5)2]2 (21),... 

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