Lewis acid diethylaluminium chloride

Note that the catalyst of Figure 10.6 contains the same titanium part as that of Figure 10.5, but that they differ in the aluminium Lewis acid and anions formed. The use of diethylaluminium chloride (DEAC, the common initiator for heterogeneous titanium catalysts) gave propene dimerisation only. This... 

The mechanism of Lewis acid-catalysed ene reactions was studied for reaction of 2-methyl-butene 44 with formaldehyde in the presence of diethylaluminium chloride in toluene 92... 

The addition of silyl ketene acetals to chiral aldonitrones requires the use of Lewis acids as activating reagents. Whereas activation with TMSOTf followed by a treatment with hydrofluoric acid-pyridine leads to the syw-adducts of isoxazolidin-5-ones (eq 91), the use of diethylaluminium chloride or boron trifluoride etherate leads to awft -compounds. ... 

The chiral a-cyano-a,p-unsaturated sulfoxide (269) has been shown to be an efficient enophile in a Lewis acid-catalysed intramolecular ene reaction [200,201]. Of the Lewis acids tested, the use of diethylaluminium chloride in dichloromethane gave particularly high diastereoselectivities (97% de) (Scheme 5.89). The results obtained using various Lewis acids are summarized in Table 5.9, in each case the major product being diastereoisomer (270a). 

---