01717nas a2200205   4500008004100000022001300041245012200054210006900176260000800245300001400253490000700267520097300274100001701247700002101264700001901285700002501304700002601329700002401355856013201379       2018                        eng d  a1144054600aVanadium-based polyoxometalate complex as a new and efficient catalyst for phenol hydroxylation under mild conditions0 aVanadiumbased polyoxometalate complex as a new and efficient cat  cAPR  a5142-51520 v423 a<p>An eco-compatible catalytic protocol for H2O2 induced hydroxylation of phenol (PH) to catechol (CT) and hydroquinone (HQ) in aqueous medium, using a polyoxovanadate (POV) complex as the catalyst, is described. The synthesis of the POV catalyst, with a new type of three dimensional framework, Na6(H2O)22(V10O28)2H2O (1) was accomplished by establishing a non-hydrothermal one-step methodology under mild conditions. The catalyst was characterized by elemental analysis, spectral studies, single crystal X-ray diffraction studies, and Brunauer–Emmett–Teller (BET) and TGA analysis. Under optimum conditions of reaction, conducted at ambient temperature, the phenol conversion reached up to 55.4% providing a TON of 138. The catalyst could be recovered easily and recycled at least up to three cycles without significant change in activity. The developed methodology is operationally simple and free from halogenated solvents or any other hazardous additives.</p>1 aSharma, Mitu1 aSaikia, Gangutri1 aAhmed, Kabirun1 aGogoi, Sandhya, Rani1 aPuranik, Vedavati, G.1 aIslam, Nashreen, S.  uhttps://library.ncl.res.in/content/vanadium-based-polyoxometalate-complex-new-and-efficient-catalyst-phenol-hydroxylation-under