Stereoselective Synthesis of Atropisomeric Acridinium Salts by the Catalyst-Controlled Cyclization of ortho-Quinone Methide Iminiums
Many congratulations to Xingxing for establishing a stereoselective route to atropisomeric acridinium salts by a Friedel-Crafts electrocyclization of ortho-quinone methide iminiums by means of ion-pairing catalysis.