Ytterbium diiodide

Sodium amide (prepared from 8.6 g of sodium metal) in a 1-L Schlenk flask is suspended in THF (300mL). With rapid stirring, MejC,H (ref. 9) (42.6g, 

312 mol) dissolved in THF (300 mL) is added by cannula to the suspension of NaNH2. Ammonia is evolved during the addition, and the suspension becomes warm. The mixture is stirred for 8h. The stirring is stopped, and the mixture is allowed to settle for 1-2 days, then Hltered. If the filtrate is cloudy it is refiltered. The THF is removed by exposing and contents of the flask to a dynamic vacuum. When all of the solvent is evaporated, the off-white sticky precipitate is exposed to vacuum for 2-3 h, then returned to 1-atm pressure with nitrogen. The residue is washed with diethyl ether (3 x 200 mL). The white powder is exposed to vacuum for 1 h. Yield NaCsMes 39 g (80%). It is used without further purification. 

Johnson, Adv. Inorg. Chem. Radiochem 20,1 (1977) T. J. Marks, Prog. Inorg. Chem., 24, SI (I978X 

Tilley, R. A. Andersen, and A. Zalkin, Inorg. Chem., 22, 8S6 (1983). The single crystal X-ray structure of this material is known, P. L. Watson, personal communication, 1981. 

LuClj + K2(CgH8) Lu(CgH8)Cl(thf) -I- 2KC1 Lu(C8H8)Cl(thf) -I- Li[o-C6H4CH2N(CH3)2] 

In marked contrast to the extensive chemistry known for the cyclopentadienyl derivatives of the lanthanide elements, little or no interest has bmn directed toward the development of the monocyclooctatetraene chemistry of these 

We have found that the late metal congeners of this important compound class are easily synthesized and can be derivatized to yield aryl monocyclo-octatetraene lanthanide complexes if the metal is small (Er-—Lu) and the ligand bulky and chelating. The synthesis of these compounds clears the way for comparative reactivity studies (with cyclopentadienyl lanthanide complexes) and allows investigations of fundamental chemical reactivity to be conducted for this ligand system. 

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LYb, Ytterbium diiodide, 27 147 IjF SnSb,2AsF3, cyc/o-heptasulfur(3 +), p-iodo-bis(4-iodo-, tris[hexanuoroanti-monate(l -)] -2(arsenic trifluoride), 27 335... 

Barbier-type Reactions Promoted by Ytterbium Diiodide... 

The same reaction can be used to prepare ytterbium diiodide, Ybla-... 

YbClj-3C4HgO, Ytterbium tridiloride-3tetrahydrofuran, 27 139, 28 289 Ybli, Ytterbium diiodide, 27 147 YbN202Si4Ci H4g, Ytterbium,... 

The compounds in which Ln atom is T -bonded with carborane, closo-lanthanoid-carboranes, can be obtained from the interaction of nido-7,8-dicarbollide dianion with lanthanoid halides [19, 24]. Samarium and ytterbium diiodides form a neutral monocage compound whereas trivalent lanthanoids give bis(dicarbollide) complexes [(C2B9H )2Gd] M (THF) (M = Na, BU4N). 

In 1977 Kagan and coworkers [137] found that Sml2 and Ybl2 appear to be effective catalysts for the Meervein-Panndorf-Verley reactions. Subsequent investigations have shown a high catalytic activity of ytterbium diiodide and especially samarium diiodide... 

Watson et al. (1981) pointed out the ppssibility of the reduction of ytterbium triiodide in ytterbium diiodide with ytterbium in tetrahydrofurane at room temperature. 

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