The well-defined heavy rare-earth ytterbium iodide complex 1 (LYbI) has been successfully employed as an efficient catalyst for the hydroboration of a wide range of aldehydes and ketones with pinacolborane (HBpin) at room temperature. The protocol requires low catalyst loadings (0.1-0.5 mol %) and proceeds rapidly (>99% conversion in <10 min). Additionally, catalyst 1 shows a good functional group tolerance even toward the hydroxyl and amino moieties and displays chemoselective hydroboration of aldehydes over ketones under mild conditions.
The sterically bulky Schiff-base ligand 1 (L 1 H) was treated with CH 3 MgI in toluene to give the unexpected homoleptic magnesium complex 2 (L 1 MgL 1 ) in good yield. However, the reaction of sterically more bulky ligand 3 (L 2 H) with CH 3 MgI in diethyl ether yielded the desired heteroleptic magnesium iodide 4 [L 2 MgI(OEt 2 )], which was further reduced with sodium to produce the Mg-Na heterodimetallic complex 5. The crystal [a]
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