There are several tips on how to assemble benzofuran rings. The commonest methods are dehydration of phenoxyalkanone beneath acidic issue,104 dehydration of o-hydroxybenzophenone underneath acidic ailment,one zero five decarboxylation of o-acetylphenoxyacetic acid or ester below alkaline condition,106 and cyclization of o-hydroxybenzophenone to bui