Mj. Hayes et al., FACILE OXIDATION OF A CARBAPORPHYRIN AT THE INTERNAL CARBON-ATOM - SYNTHESIS OF NOVEL BENZO[18]ANNULENE KETALS, Chemical communications, (21), 1998, pp. 2409-2410
Treatment of benzocarbaporphyrin 2 with refluxing FeCl3 in CHCl3-alcoh
ol mixtures leads to a remarkably selective oxidation at the interior
carbon atom to produce dialkoxy products 5; these species show potenti
ally valuable long wavelength absorptions in their UV-VIS spectra.