Cerium is the less rare "rare earth"; its salts are commercially available and inexpensive. However, screening of lanthanide triflates as Lewis acid catalysts in the Friedel-Crafts acylation of aromatics skipped cerium triflate. Now, catalytic Friedel-Crafts acylations of activated benzenes are performed by using cerium (III) triflate as catalyst. For less activated arenes, addition of lithium perchlorate as co-catalyst is required. In all cases aromatic ketones are obtained in very good yields.
Why has Cerium (III) Triflate been Forgotten among the Catalysts for the Friedel-Crafts Acylation?
DE NINO, Antonio;DALPOZZO, Renato;MAIUOLO, Loredana;TAGARELLI, Antonio
2005-01-01
Abstract
Cerium is the less rare "rare earth"; its salts are commercially available and inexpensive. However, screening of lanthanide triflates as Lewis acid catalysts in the Friedel-Crafts acylation of aromatics skipped cerium triflate. Now, catalytic Friedel-Crafts acylations of activated benzenes are performed by using cerium (III) triflate as catalyst. For less activated arenes, addition of lithium perchlorate as co-catalyst is required. In all cases aromatic ketones are obtained in very good yields.File in questo prodotto:
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