Stensrud, Kenneth F. published the artcileFluorinated photoremovable protecting groups: the influence of fluoro substituents on the photo-Favorskii rearrangement, Synthetic Route of 1998-61-4, the publication is Photochemical & Photobiological Sciences (2008), 7(5), 614-624, database is CAplus and MEDLINE.
To further explore the nature of the photo-Favorskii rearrangement and its commitment to substrate photorelease from p-hydroxyphenacyl (pHP), an array of ten new fluorinated pHP γ-aminobutyric acid (GABA) derivatives was synthesized and photolyzed. The effects of fluorine substitution on the chromophore and the photophys. and photochem. properties of these new chromophores were shown to be derived primarily from the changes in the ground state pKa of the phenolic groups. The quantum yields and rate constants for release are clustered around Φdis = 0.20 ± 0.05 and kr = 8 ± 7 × 107 s-1 (H2O), resp. The triplet lifetimes of the pHP GABA derivatives were concentrated in the range of 0.4-6.0 ns (H2O). The corresponding deprotonated conjugate bases displayed reduced efficiencies by 50% or more (one exception) and exhibited a weak fluorescence in pH 8.2 buffer. Pump-probe spectroscopy studies have further defined the rates of intersystem crossing and the lifetimes of the reactive triplet state of the fluoro pHP chromophore.
Photochemical & Photobiological Sciences published new progress about 1998-61-4. 1998-61-4 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Benzene,Phenol, name is 4-Bromo-2,3,5,6-tetrafluorophenol, and the molecular formula is C20H12N2O2, Synthetic Route of 1998-61-4.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary