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Anhydrous lanthanide halides - chlorides and bromides - can act as homogene
ous catalysts of Friedel-Crafts acylations. The catalytic activity is relat
ed to the solubility of these anhydrous salts, More soluble THF or dioxane
(Diox.) neodymium and samarium adducts are more active catalysts. (C) 2000
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