There are lots of ways to assemble benzofuran rings. The commonest solutions are dehydration of phenoxyalkanone under acidic situation,104 dehydration of o-hydroxybenzophenone beneath acidic affliction,a hundred and five decarboxylation of o-acetylphenoxyacetic acid or ester less than alkaline issue,106 and cyclization of o-hydroxybenzophenone to c