The solid superacid of BCl3/silica–alumina
type was studied. It was found that a suitable carrier for superacid synthesis
with BCl3 vapours should possess OH groups with strong acid properties
situated in the proximity of strong Lewis centres. Superacid Brönsted
centres are formed as a result of the reaction between adjacent OH groups
(at least one of which should be of high acid strength) of the carrier and
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