Minto, Robert E. published the artcileLaser flash photolysis study of photodehydroxylation phenomena of 9-phenylxanthen-9-ol and photobehavior of related intermediates. Enhanced electrophilicity of 9-phenylxanthenium cation singlet, Recommanded Product: 9-Phenyl-9H-xanthen-9-ol, the publication is Journal of the American Chemical Society (1989), 111(24), 8858-66, database is CAplus.
In the course of 248-nm laser flash photolysis, solutions of 9-phenylxanthen-9-ol (I) undergo homolytic and heterolytic photodehydroxylation, the relative efficiency of which depends strongly on the solvent nature. Polar/hydroxylic solvents, especially aqueous mixtures, cause copious formation of 9-phenylxanthenium cation (II), the ground- and excited-state properties of which are conveniently studied by single- and double-laser flash photolysis. In 1:1 H2O/MeCN, the quantum yield of carbenium ion generation is 0.4 ± 0.1, only 2% of which evolves through an adiabatic route. In polar but nonhydroxylic solvents (e.g., MeCN and CH2ClCH2Cl) also, the cation is photogenerated in small yields sufficient for time-resolved spectroscopic detection and study in these relatively neutral and inert media. In relatively nonpolar solvents, e.g., n-heptane and C6H6, photolysis of I is dominated by homolytic cleavage to 9-phenylxanthenyl radical III. The short-lived triplets of I (τT ≤ 0.3 μs) are also observed in nonaqueous solvents (ϕT = 0.05 in MeCN). In comparison to the weak, fast-decaying, double-doublet fluorescence of III (λmaxF = 590 nm, τF ≤ 5 ns), the singlet-singlet fluorescence from II is intense and long-lived (λmaxF = 550 nm, τF = 25 ns in MeCN in the absence of nucleophilic quenchers) and is almost nonquenchable by oxygen (kq ≤ 5 × 108M-1 s-1). The electrophilicity of the lowest excited singlet state of II, measured in terms of rate constants (kq) of bimol. quenching by anions and lone-pair containing mols., is considerably more pronounced than that of the ground state (i.e., kq‘s are higher for the excited state by several orders of magnitude).
Journal of the American Chemical Society published new progress about 596-38-3. 596-38-3 belongs to alcohols-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Benzene,Alcohol, name is 9-Phenyl-9H-xanthen-9-ol, and the molecular formula is C19H14O2, Recommanded Product: 9-Phenyl-9H-xanthen-9-ol.
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https://en.wikipedia.org/wiki/Alcohol,
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