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There are lots of methods to construct benzofuran rings. The commonest methods are dehydration of phenoxyalkanone underneath acidic ailment,104 dehydration of o-hydroxybenzophenone below acidic issue,one zero five decarboxylation of o-acetylphenoxyacetic acid or ester underneath alkaline affliction,106 and cyclization of o-hydroxybenzophenone to bu