Background: As the phenols and its derivatives are considered as versatile precursors, herbicides,
drugs and antioxidants, the synthesis of phenols has been gaining much attention during the last
decades. Despite the numerous methods for phenol synthesis there is a serious need for “green” protocols
with greater environmental benign and economic viability.
Method: We used a highly abundant and inexpensive natural feedstock WEBPA (Water Extract of Banana
Peel Ashes) with 30% aqueous H2
as an oxidant for the synthesis of phenol and its derivatives.
Results: Ipso-hydroxylation of twelve different types aryl and hetero aryl boronic acids with both electron
donating and electron withdrawing groups such as OMe, Me, Cl, NO2
, COMe etc. has been carried
out by the newly developed protocol with excellent yields in a short period of time. The catalytic system
has also been found effective up to 5th
cycle without significant loss of activity.
Conclusion: In conclusion, we have developed a reusable, mild, and efficient protocol for the ipsohydroxylation
of aryl/heteroarylboronic acids. This protocol seems to be one of the greenest and economic
alternatives to the existing protocol.