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2,4,6-Triphenylpyrylium tetrafluoroborate is used as a sensitizer to carry out the photo oxidation of cathecol. It is also used in the preparation of three N-alkylpyridinium photosensitizers by reacting with (1R,2S)-(-)-norephedrine, (S)-(+)-2-(aminomethyl)pyrrolidine and (R)-(-)-1-cyclohexylethylamine.
K Hollmann. [Experiences with replacement of the eyelid-levator].Fortschr Kiefer Gesichtschir.1977,2298-99.
Mercedes Alvaro.; Pilar Formentín.; Hermenegildo García.; Emilio Palomares.; María J Sabater. Chiral N-alkyl-2,4,6-triphenylpyridiniums as enantioselective triplet photosensitizers. laser flash photolysis and preparative studies.J Org Chem.2002,67(15), 5184-5189.
Amines react with pyrylium salts to give N-alkylpyridinium salts. Since the pyridine can be displaced by a variety of nucleophiles, the result is that the amine has been converted to a useful alkylating species: J. Chem. Soc., Perkin 1, 418 (1979). Reviews: Tetrahedron, 36, 679 (1980); Angew. Chem. Int. Ed., 23, 420 (1984); Russ. Chem. Rev., 51, 469 (1982):
For a review on use as an electron-transfer photosensitizer, see: Chem. Rev., 94, 1063 (1994).
Gefahrenhinweise (EU): H301-H315-H319-H335
Toxic if swallowed. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF SWALLOWED: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.