Samarium tris

Samarium, tris(triphenylphosphine oxide)bis-(diethyldithiophosphato)-structure, 1,78 Samarium complexes dipositive oxidation state hydrated ions, 3, 1109 Samarium(III) complexes salicylic acid crystal structure, 2, 481 Sampsonite, 3, 265... 

Miyanaga [2] prepared moderate molecular weight polyglycidol ethers, (II), by polymerizing the corresponding glycidol ether with samarium triisopropoxide, samarium tris(tetramethyl heptanedionate), and yttrium tris(tetramethyl hep-tanedionate) with methyl aluminoxane. 

OjScC45H , Scandium, tris(2,6-di-rerr-butyl-4-methylphenoxo)-, 27 167 03SmC42H63, Samarium, tris(2,6-di-ferr-bu-tylphenoxo)-, 27 166... 

Sm02C2sH44, Samarium(II), bis(Ti -penta-methylcyclopentadienyl)bis(tetra-hydrofuran)-, 27 155, 28 297 Sm03C42H63, Samarium, tris(2,6-di-tm-butylphenoxo)-, 27 166 Sm2Cl2Si4C44Hg4, Samarium, tetrakis T -l,3-bis(trimethylsilyl)cyclopentadienyl]di-p-chloro-di-, 27 171 SnCjHio, Stannane, trimethyl-, cobalt complex, 29 175, 178,180 SnCljPjC52H4, Stannate(l-), hexachloro-, 3,3,4,5-tetrahydro-l,l,33-tetraphenyl-lfM,2,3-triphospholium, 27 255 SnS4C24H2o, Tin(IV), tetrakis(benzenethio-lato)-,29 18... 

Samarium, tris(triphenylphosphine oxide)bis-(diethyldithiophosphato)-structure, 78... 

The major synthetic route leading to homoleptic lanthanide tris(amidinates) and guanidinates, however, is the metathetical reaction between anhydrous lanthanide trichlorides and preformed lithium amidinates or guanidinates, respectively, in a molar ratio of 1 3. This is outlined in Scheme 69, showing a samarium(lll) guanidinate as a typical example. ... 

A sterically hindered homoleptic samarium(lll) tris(amidinate), Sm[HC (NC6H3Pr2-2,6)2]3, was obtained by oxidation of the corresponding Sm(II) precursor (cf. Scheme 54). Magnetic data and the results of low temperature absorption, luminescence, and magnetic circular dichrosim spectra have been... 

In these transformations, organocopper compounds are often the reagents of choice, although recently other metals such as aluminum, titanium, samarium and indium have also proven to be highly useful. Since earlier contributions to this field have already been summarized extensively [1], we shall concentrate on more recent contributions published after 1980. Rather than trying to be comprehendsive, representative examples with references to the most important reaction types will be given. 

This point is borne out by the structure of tris indenyl samarium (5d). An earlier report of the nmr spectrum was interpreted as evidence of covalent bonding in the tetrahydrofuran adduct of samarium triindenide 66). Indenyl anion. 

By controlling the stoichiometry of the reaction between lanthanide trichlorides and sodium cyclopentadienide it is possible to replace the chloride ions stepwise. Equihbria are rapidly established, so the addition of Ln(C5H5)3 to one or two equivalents of LnCls will produce M(C5H5)2C1 and M(C5H5)Cl2, respectively. The dichlorides are known only for the lanthanides from samarium to lutetium and are obtained from THF solutions as tris-THF adducts. 

Si3NO,DPiRu1CsaHMI, Ruthenate(l -), deca-carbonyl-lK C,2K C,3KJC-(x-hydrido-l 2K2//-bis(triethylsilyl)-lK5i,2KS/-trion-gu(o-tri-p-nitrido-bis(triphenyl-phosphorus)-(l +), 26 269 SmOC H2, Samarium(III), tris(rf-cyclo-pentadienyl)(tetrahydrofuran)-, 26 21... 

Addition a to a cyano group Benzyltriethylammonium chloride, 239 Nickel, 197 Addition a to halogen Diiodomethane-Samarium, 113 Fluoromethyl phenyl sulfone, 135 Tris(dimethylamino)sulfonium difluo-rotrimethylsilicate, 336 Addition a to oxygen... 

REDUCTION, REAGENTS Aluminum amalgam. Borane-Dimethyl sulfide. Borane-Tetrahydrofurane. t-Butylaminoborane. /-Butyl-9-borabicyclo[3.3.1]nonane. Cobalt boride— f-Butylamineborane. Diisobutylaluminum hydride. Diisopropylamine-Borane. Diphenylamine-Borane. Diphenyltin dihydride. NB-Enantrane. NB-Enantride. Erbium chloride. Hydrazine, lodotrimethylsilane. Lithium-Ammonia. Lithium aluminum hydride. Lithium borohydride. Lithium bronze. Lithium n-butylborohydride. Lithium 9,9-di-n-butyl-9-borabicyclo[3.3.11nonate. Lithium diisobutyl-f-butylaluminum hydride. Lithium tris[(3-ethyl-3pentylK>xy)aluminum hydride. Nickel-Graphite. Potassium tri-sec-butylborohydride. Samarium(II) iodide. Sodium-Ammonia. Sodium bis(2-mcthoxyethoxy)aluminum hydride. 

Preformation of homoleptic lanthanide tris(tetramethylaluminate) complexes Ln(AlMe4)3 (Ln = Y, La, Ce, Pr, Nd, Sm, Gd) and Et2AlCl generated extremely active and highly cis-1,4-slcrcosclective binary diene polymerization initiators (Fischbach et al., 2006, personal communication) [150]. Optimal performance in isoprene polymerization was observed for most of the lanthanide metal centers for (Cl) (Ln) ratios of 2 1 (Table 16). Only the samarium... 

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