ChemInform Abstract: A Well‐Defined Aluminum‐Based Lewis Acid as an Effective Catalyst for Diels—Alder Transformations.

Abstract

In Ta ble 1, entries 5-7 of this Communication,the chemical structures of three products 12, 22,and 23 were printed in out of order.The correct structures andorder are listed here. The authors apologize for this oversight.Table1.L Al(OTf) 2 /Na[BAr Cl 4 ]-and tBuCl/AgOTf( HBA)-catalyzed Diels-Alder reactionso fd ienophile 4 with 2,3-dimethyl-1,3-butadiene( 1), 2methyl-1,3-butadiene (18), or cyclohexadiene ( 19). The results are listed as:t ime (h), yield (%), trans/cis or endo/exo,a nd para/meta ratios for each run. Entry Diene Dienophile AdductLAl (OTf) 2 /Na[BAr Cl 4 ]H BA 5 12 h2 4h 93 %5 8% 99:1 99:1 --6 12 h [a] 10 h 97 %53 % 99:1 99:1 > 99 %97 % 7 7h [b] 24 h 94 %25 % 99:1 99:1 --[a] 10 %C atalyst loading. [b] 15 %C atalystloading.