Chinese Journal of Applied Chemistry

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Oxybromination of Spiro[fluorene-9,9′-xanthene] over 12-Tungstophosphoric Acid Supported on Zirconia

REN Baoyi*, ZHAO Yang, LI Xiang, RAN Fanpeng, JIN Xiaodan   

  1. (College of Applied Chemistry,Shenyang University of Chemical Technology,Shenyang 110142,China)
  • Received:2013-02-19 Revised:2013-04-04 Published:2013-11-10 Online:2013-11-10

Abstract: A catalyst for the oxybromination of spiro[fluorene-9,9′-xanthene], 12-tungstophosphoric acid(TPA) supported on zirconia, was prepared. Effects of TPA loading and activation temperature on the structure of the catalyst and the catalytic performance for oxybromination of spiro[fluorine-9,9′-xanthene](SFX) have been investigated. The results of XRD and FTIR analysis show that the monoclinic zirconia transformed to tetragonal phase with the increase of TPA loading and calcinations temperature. A preliminary study on catalysts with 15%(mass fraction) TPA indicated that calcination at 300 ℃ could greatly enhance the stability of catalyst. The bromination position of the products was confirmed in the position of 2 of SFX from 1H NMR.

Key words: tungstophosphoric acid, zirconia, oxybromination, spiro[fluorene-xanthene]

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