This work presents the results of studying behavior catalytic systems formed on basis trichlorotris-(tetrahydrofuranate)chromium(III) in presence sulfur-containing tridentate SOS-type ligands and activated by various organoaluminum compounds. In formation systems, following compounds were used: - bis-(2-methylthioethyl) ether, bis-(2-ethylthioethyl) ether bis-(2-phenylthioethyl) triethylaluminu...

The reactivity of triethylaluminum towards salicylaldimine sulfonamides was probed, affording well-defined complexes through consecutive protonolysis of two Al-C bonds by the proligand. These complexes, when combined with an achiral anilinic N-oxide, catalyze the asymmetric addition of trimethylsilylcyanide to a wide range of aldehydes, with good activity and enantioselectivity (up to 91% ee). ...

Fifty years ago Ziegler and co-workers reported the Aufbaureaktion for alkylaluminum compounds.[1] This reaction involves a stepwise insertion of ethylene into the Al C bonds of, for example, triethylaluminum to give long-chain trialkylaluminum compounds [Eq. (1)]. Today, this chaingrowth reaction is commercially exploited for the synthesis of linear -olefins and primary alcohols from ethylene.[2]

Two acyclic Schiff-base ligands, bis-5,5′-(1,3-propanediyldiimino)-2,2-dimethyl-4-hexene-3-one and bis-5,5′-(1,3-ethanediyldiimino)-2,2-dimethyl-4-hexene-3-one, were used to complex homoleptic triethylaluminum and tris[bis(trimethylsilyl)amino]alu minum, respectively. The acid–base reactions proceeded in excellent yields with elimination of ethane or bis(trimethylsilyl)amine during in situ depr...