Reaction of alkylaluminum chlorides with water

Alkylaluminum dichloride–ether complexes which are fully soluble in hydrocarbons as catalysts for the synthesis of exo-olefin terminated polyisobutylene at room temperature

“…A similar reaction pathway was also proposed for the interaction of EtAlCl 2 with H 2 O, which proceeds the formation of an aqua-complex EtAlCl 2 Â H 2 O, followed by its transformation into alumoxane derivatives such as (Cl 2 Al) 2 O and (C 2 H 5 AlCl) 2 O. 31 The formation of alumoxane during the interaction of EtAlCl 2 with H 2 O was also observed by 1 H NMR spectroscopy (see Fig. 6).…”

“…4b and S3 †) as well as literature data, 35 we can postulate the formation of dinuclear chlorine-bridged dimers of EtAlCl 2 rather than alkyl-bridged dimers. The addition of ether to these dimers leads to the formation of a monomeric complex (Scheme 3a) in non-polar C 6 D 6 and n-hexane 31,32 as evidenced by 1 H NMR spectroscopy (Fig. 4c).…”

“…Based on the 1 H NMR study as well as literature data, 31,36 the reaction of H 2 O with EtAlCl 2 Â O i Pr 2 is accompanied by the direct hydrolysis of Al-C bonds followed by the formation of an etherate of the corresponding alumoxane 31,32 (Scheme 3b). A similar reaction pathway was also proposed for the interaction of EtAlCl 2 with H 2 O, which proceeds the formation of an aqua-complex EtAlCl 2 Â H 2 O, followed by its transformation into alumoxane derivatives such as (Cl 2 Al) 2 O and (C 2 H 5 AlCl) 2 O.…”

“…of water into an NMR tube containing a solution of EtAlCl 2 (0.05 M) in C 6 D 6 led to a fast reaction with intensive evolution of ethane, resulting in the formation of a precipitate. 31 1 H NMR analysis of the solution revealed the broadening of the peaks of the ethyl group as well as the appearance of low intensity signals at 4.06 ppm and 2.43 ppm, which could be attributed to the hydroxyl proton of Et n AlCl 2Àn OH (ref. 31 and 32) (n ¼ 0 or 1) and the formation of aluminoxane-like structures, 33 respectively (compare Fig.…”

Synthesis of Well-Defined Alternating Copolymers by Controlled/Living Radical Polymerization in the Presence of Lewis Acids

“…It has been shown that several structures of hydrated Lewis acids with different molecular weights may be formed, depending on the conditions. 48,49 Therefore, it is difficult to estimate the contribution of these hydrated forms of the Lewis acid in gravimetry analysis. To overcome this problem, the following procedure was adopted.…”