Ren, Baoyi published the artcileOxybromination of spiro [fluorene-9,9′-xanthene] over 12-tungstophosphoric acid supported on zirconia, HPLC of Formula: 159-62-6, the publication is Yingyong Huaxue (2013), 30(11), 1299-1303, database is CAplus.
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 anal. 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°C could greatly enhance the stability of catalyst. The bromination position of the products was confirmed in the position of 2 of SFX from NMR.
Yingyong Huaxue published new progress about 159-62-6. 159-62-6 belongs to naphthyridine, auxiliary class Other Aromatic Heterocyclic,Spiro, name is Spiro[fluorene-9,9′-xanthene], and the molecular formula is C25H16O, HPLC of Formula: 159-62-6.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem