High selectivity is observed during a Friedel–Crafts acylation/demethylation cascade.
In contrast to this cascade, oxygen-containing acylating reagents do not undergo the
demethylation step. By the methodology elaborated here, an access is provided to important
intermediates for the total synthesis of seminaphthorhodafluor (SNARF) dyes.
Key words
Friedel–Crafts acylation - demethylation cascade - aluminum chloride - selectivity