A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 405-50-5, Name is 2-(4-Fluorophenyl)acetic acid, molecular formula is C8H7FO2. In an article, author is Yang, Xiaofeng,once mentioned of 405-50-5, Safety of 2-(4-Fluorophenyl)acetic acid.
A through-bond energy transfer-based ratiometric fluorescent pH probe: For extreme acidity and extreme alkaline detection with large emission shifts
A ratiometric fluorescence pH probe 1 based on through-bond energy transfer (TBET) with a 2-(2-hydroxyphenyl)benzoxazole (HBO) as donor and a Rhodamine derivative as acceptor is developed through simple condensation reaction. The probe exhibits a ratiometric fluorescence emission (I-593/I-422) characteristics and linear response to extreme acidity range of 5.00-2.88, and a ratiometric fluorescence emission (I-555/I-422) characteristics and linear response to extreme alkaline range of 10.00-13.78, respectively. Moreover, 1 possesses highly selective response to pH over metal ions, good reversibility and excellent photostability. Probe 1 is cellpermeable and can distinguish near pH 5.55 fluctuations in Hela cells. Furthermore, 1 can be immobilized on a test paper, which shows a rapid and reversible colorimetric response to HCl/NH3 vapor by the naked-eye.
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem