Mono- and Bimetallic Aluminum Alkyl, Alkoxide, Halide and Hydride Complexes of a Bulky Conjugated Bis-Guanidinate(CBG) Ligand and Aluminum Alkyls as Precatalysts for Carbonyl Hydroboration.

Tetra-aryl-substituted symmetrical conjugated bis-guanidine (CBG) ligands such as L (3H) [L(3H) = {(ArHN)(ArHN)C═N-C═NAr(NHAr)}; Ar = 2,6-Me-CH (L(3H)), 2,6-Et-CH (L(3H)), and 2,6-Pr-CH (L(3H))] have been employed to synthesize a series of four- and six-membered aluminum heterocycles (-) for the first time. Generally, aluminum complexes bearing ,'- chelated guanidinate and β-diketiminate/dipyrromethene ligand systems form four- and six-membered heterocycles, respectively. However, the conjugated bis-guanidine ligand has the capability of forming both four- and six-membered heterocycles possessing multimetal centers within the same molecule; this is due to the presence of three acidic protons, which can be easily deprotonated (at least two protons) upon treatment with metal reagents.

Organomagnesium amide catalyzed cross-dehydrocoupling of organosilanes with amines.

The synthesis of novel heteroleptic organomagnesium(ii) amide complexes [IMesMg(Ar){N(SiMe)}]; (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene), Ar = 2,6-MeCH (Xyl) (1) and 2,4,6-MeCH (Mes) (2) is reported. Both compounds 1 and 2 were confirmed by multinuclear (H, C and Si) magnetic resonance spectroscopy, elemental analysis and single crystal X-ray structural analysis. Furthermore, the organomagnesium amide pre-catalyzed cross-dehydrogenative coupling of organosilanes with amines has been investigated.