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Benzisoxazole 2‐oxides as novel UV absorbers and photooxidation inhibitors
Author(s) -
Kociolek Martin George,
Casbohm Jerry S.
Publication year - 2013
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.3161
Subject(s) - chemistry , solvent , absorption (acoustics) , polystyrene , ultraviolet visible spectroscopy , ultraviolet , absorption spectroscopy , molar ratio , photochemistry , polymer , molar concentration , organic chemistry , catalysis , physics , quantum mechanics , acoustics
Compounds with strong absorptions in the ultraviolet (UV) region of the spectrum, particularly the UVA and UVB, have seen much interest as UV screeners or absorbers in a wide variety of commercial products . A series of benzisoxazole 2‐oxides have been synthesized and characterized by UV–vis spectroscopy. A number of derivatives have been shown to posses moderate to strong molar absorption coefficients in the UVB range (ca. 300 nm), the strongest being those derived from benzophenones. Three other derivatives containing additional electron withdrawing groups showed strong molar absorption coefficients in the UVA (ca. 340 nm). Solvent effects on the parent derivatives show changes in the molar absorption coefficients with little changes in the λ max values. Preliminary studies of these compounds as potential additives to prevent photooxidation of polystyrene showed considerable inhibition of polymer degradation with the parent unsubstituted benzisoxazole 2‐oxide compounds being the most effective. Copyright © 2013 John Wiley & Sons, Ltd.