Lanthanide ii compounds

Tris(i/5-cyclopentadienyl)lanthanides were the first authentic organolanth-anides to be prepared1 and bis(t/5-cyclopentadienyl)lanthanide(II) compounds have played a germinal part in the development of lower oxidation state organolanthanide chemistry.2 These cyclopentadienyls are sources of coordination compounds of structural interest and are reagents for the synthesis of other organolanthanides, for example, bis- and mono(t)5-cyclopentadienyl)lanthanide(III) derivatives.2... 

Tris(i -cyclopentadienyl)lantbanides were the first authentic organolanthan-ides to be prepared and bis(>/ -cyclopentadienyl)lanthanide(II) compounds... 

Theoretical Treatment of Redox Processes Involving Lanthanide(II) Compounds Reactivity of Organosamarium(II) and Organothulium(II) Complexes with CO2 and Pyridine, S. LabouiUe, F. Nief, L. Maron, Journal of Physical Chemistry A 2011, 115, 8295. 

Low-valent lanthanides represented by Sm(II) compounds induce one-electron reduction. Recycling of the Sm(II) species is first performed by electrochemical reduction of the Sm(III) species [32], In one-component cell electrolysis, the use of sacrificial anodes of Mg or A1 allows the samarium-catalyzed pinacol coupling. Samarium alkoxides are involved in the transmet-allation reaction of Sm(III)/Mg(II), liberating the Sm(III) species followed by further electrochemical reduction to re-enter the catalytic cycle. The Mg(II) ion is formed in situ by anodic oxidation. SmCl3 can be used in DMF or NMP as a catalyst precursor without the preparation of air- and water-sensitive Sm(II) derivatives such as Sml2 or Cp2Sm. 

Homoleptic germylenes, preparation and properties, 3, 773 Homoleptic lanthanide(II) alkyl compounds, properties, 4, 4 Homoleptic manganese aryl complexes, preparation, 5, 816 Homoleptic manganese isonitrilates, preparation, 5, 773—774 Homoleptic molybdenum complexes, preparation and characteristics, 5, 514... 

The bistrimethylsilylmethyl ligand has been utilized by Lappert and coworkers to stabilize a number of unusual valence states for lanthanide and transition metals (65-67). In group IV the bis(bistrimethylsilylmethyl)-germanium(II), tin(II), and lead(II) compounds have all been synthesized and the germanium and tin compound shown to be monomeric in cyclohexane solution (68, 69). 

It is a commonplace to say that there has been explosive growth in the use of lanthanides in organic chemistry. For many years, the use of cerium(iv) compounds as oxidants was widespread, but more recently a whole range of other compounds have made their appearance. Thus samarium(ii) compounds are now routinely used as one-electron reducing agents and the use of trifluoromethanesulfonate ( triflate ) salts of scandium and the lanthanides as water-soluble Lewis acid catalysts is widespread. Beta-diketonate complexes and alkoxides have also come into use there are even applications of mischmetal in organic synthesis. 

In contrast to the reactions of trivalent lanthanide Cp compounds (CpsLn) with iron(II) chloride, CpsUCl does... 

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