Acidity of HCl in Neutral Buffered Chloroaluminate Molten Salts

SO3H-Functionalized Ionic Liquids for Selective Alkylation of p-Cresol with tert-Butanol

“…Yang and Kou have determined the Lewis acidity of several chloroaluminate ionic liquids by means of a spectroscopic probe method. Recently, Smith et al, King et al, and Thomazeau et al described a procedure to evaluate the Brønsted superacidity of HCl in liquid chloroaluminate or the Brønsted acidity of HNTf 2 [NTf 2 = N(CF 3 SO 2 ) 2 ] in [BMIm][NTf 2 ] ionic liquid using the Hammett acidity function determined by UV−vis spectroscopy (Hammett method), wherein a basic indicator was used to trap the dissociative proton. Duan et al determined the acidity of several protic pyridinium ionic liquids by the Hammett method.…”