The facile synthesis of Sml2 and Ybl2 from corresponding metals in THF is described. The reactivity of these potentially powerful reducing agents toward a variety of functional groups is tested. Epoxides and sulfoxides are deoxygenated. Aldehydes are selectively reduced in presence of a ketone. Alkyl halides or tosylates are converted into alkanes. Only coupling products are obtained from benzylic or allylic halides. In the presence of a SmI2-THF solution, tertiary alcohols are easily obtained from reactions between ketones and alkyl halides. In a similar manner, Sml2 promotes straightforward alkylation of ketones by alkyl sulfonates. Selective addition of polyfunctional halides or tosylates to ketones may be performed. In these reactions, catalytic amounts of FeCb enhance the reactivity.

Metallisches Samarium oder Ytterbium reagieren in Tetrahydrofuran mit 1,2‐Dijodäthan (II) bei Raumtemperatur unter Argon oder Stickstoff glatt zu den zweiwertigen Lanthanidjodiden (III).

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