Acetic anhydride, arene acetylation

The yield was 74.3%. It is noteworthy that only hexamer was produced and neither tetramer nor octamer was found. Acetylation was carried out quantitatively using excess acetic anhydride and /7-methylcalix[6]arene in pyridine at r.t. for 2 hrs. 

Friedel-Crafts Reactions. Aluminum trifluoromethanesulfonate has been used for the Friedel-Crafts alkylation reaction of toluene with isopropyl and tert-butyl chlorides (eq 1), and for the acylation of benzene and toluene with acetyl and benzoyl chlorides in low to moderate yields. Intramolecular Friedel-Crafts acylation of an aromatic compound with Meldrum s acid has also been reported using catalytic amounts of Al(OTf)3. Acylation of 2-methoxynaphthalene with acetic anhydride has been reported using Al(OTf)3 and lithium perchlorate as an additive to afford the corresponding 6-acetylated adduct in 83% yield. Effective acylation of arenes with carboxylic acids has also been disclosed using polystyrene-supported Al(OTf)3. ... 

In the presence of a stoichiometric amount of SbCls, Friedel-Crafts acylation proceeds with acyl hahdes and acid anhydrides [47], SbCls also promotes the Fries rearrangement of phenyl acetates [48], The electrophilic acylation of fluoro-olefins with acetyl fluoride or benzoyl fluoride is promoted by SbFs in liquid SOy [49], The Friedel-Crafts acylation of benzene and electron-rich arenes is successfully catalyzed by SbCl5-AgClO4 [50], SbCl, Ar.BCl [51], SbCl5-LiClO4 [52], or CaCI, AgSbFg [53] (Scheme 14,19), Acyl chlorides, acid anhydrides, and acyl enolates are used as sources of acyl groups. 

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