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• W2589333690 startingPage "3425" @default.
• W2589333690 abstract "The photodeprotection of formaldehyde was investigated for 3-(1-hydroxypropan-2-yl)benzophenone (3-HPBP) with ultrafast time-resolved spectroscopy. The femtosecond transient absorption results indicated the singlet excited state of 3-HPBP transformed efficiently into its triplet state by a fast intersystem crossing. In acidic (pH = 0) and basic (pH = 12.5) aqueous solutions, the triplet intermediate was a key precursor for the deprotection of formaldehyde via two different pathways. However, little photodeprotection was observed in neutral (pH = 7) aqueous solution where the triplet intermediate appeared to undergo a proton coupled electron transfer process to form a ketyl radical transient. The important benzylic biradical intermediates seen in the acidic and basic aqueous solutions were identified by time-resolved resonance Raman spectra whose vibrational frequency patterns were consistent with DFT calculation results for the benzylic biradical intermediate. The results here indicate that the β-carbon alcohol group of the triplet state 3-HPBP is deprotonated in basic aqueous solutions and this leads to a heterolytic C-C bond cleavage to deprotect formaldehyde and produce the benzylic carbanion triplet state species, whereas protonation of the carbonyl moiety of the triplet state 3-HPBP leads to direct generation of a benzylic biradical intermediate and the deprotection of formaldehyde in acidic aqueous solutions via a homolytic C-C bond cleavage." @default.
• W2589333690 created "2017-03-03" @default.
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• W2589333690 date "2017-03-10" @default.
• W2589333690 modified "2023-10-05" @default.
• W2589333690 title "pH Dependent Photodeprotection of Formaldehyde: Homolytic C–C Scission in Acidic Aqueous Solution versus Heterolytic C–C Scission in Basic Aqueous Solution" @default.
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• W2589333690 doi "https://doi.org/10.1021/acs.joc.6b02756" @default.
• W2589333690 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28224790" @default.
• W2589333690 hasPublicationYear "2017" @default.
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