abstract |
Phthalic acid was dehydrated in heptane with heating/refluxing in the presence of a catalytic amount of an arylboronic acid compound (e.g., 2-(diisopropylaminomethyl)phenylboronic acid or 2,6-bis(diisopropylaminomethyl)phenylboronic acid). As a result, phthalic anhydride was obtained in a high yield. |