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- W2016097865 abstract "In aqueous media, photochemical excitation (S1) of hydroxyadamantyl, diphenylhydroxymethyl, and hydroxypropyl derivatives of 4-phenylphenol 5–9 leads to solvent-assisted deprotonation of the phenol OH, and protonation of the benzyl alcohol coupled with dehydration, that delivers quinone methides (QMs) 14–18. The QMs react with CH3OH converting them in high quantum yields to the photosolvolysis products (overall Φ ~ 0.1–0.5). QMs were characterized by laser flash photolysis in CH3CN-H2O and TFE. In TFE, the zwitterionic QM 15 has a lifetime of 250 ns, whereas para QMs 16 and 17 have lifetimes of 500 μs and 1.1 s, respectively. Introduction of the steric hindrance to the parent QM structure (with the adamantyl moiety), or additional stabilization by two phenyl rings, results in an increase of QM lifetimes and selectivity in the reactions with nucleophiles. In vitro studies of the antiproliferative activity of photochemically generated QMs 15–17 were carried out on one human cancer cell line. Irradiation of cells incubated with 7 showed enhanced antiproliferative activity compared to cells that were not irradiated, in accordance with the activity being due to the formation of QM 16." @default.
- W2016097865 created "2016-06-24" @default.
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- W2016097865 date "2011-12-01" @default.
- W2016097865 modified "2023-09-27" @default.
- W2016097865 title "Sterically congested quinone methides in photodehydration reactions of 4-hydroxybiphenyl derivatives and investigation of their antiproliferative activity" @default.
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- W2016097865 doi "https://doi.org/10.1039/c1pp05182b" @default.
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