1993
DOI: 10.1016/1010-6030(93)85020-9
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Singlet state photochemistry of dibenzyl ketone and its o-tolyl derivatives

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Cited by 13 publications
(6 citation statements)
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“…1-Hydroxy-3-phenyl-2-propanone Compared to 1,3-Diphenyl-2- propanone. The triplet state of 1,3-diphenyl-2-propanone is too short-lived (<1 ns) , to allow direct detection in the nanosecond time regime, since it undergoes very fast and efficient (Φ α = 0.84 ± 0.06) 49c α cleavage to produce a pair of phenylmethyl and phenylacetyl radicals. The latter undergoes fast decarbonylation ( k CO ca.…”
Section: Resultssupporting
confidence: 91%
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“…1-Hydroxy-3-phenyl-2-propanone Compared to 1,3-Diphenyl-2- propanone. The triplet state of 1,3-diphenyl-2-propanone is too short-lived (<1 ns) , to allow direct detection in the nanosecond time regime, since it undergoes very fast and efficient (Φ α = 0.84 ± 0.06) 49c α cleavage to produce a pair of phenylmethyl and phenylacetyl radicals. The latter undergoes fast decarbonylation ( k CO ca.…”
Section: Resultssupporting
confidence: 91%
“…5 × 10 6 M -1 s -1 ) to produce a second phenylmethyl radical. In accordance with previous studies, , laser-flash photolysis produced a transient absorption at 317 nm characteristic for phenylmethyl radicals (Figure ). The absorption is characterized by a step-and-rise pattern, in which the initial sudden rise corresponds to the fast α cleavage to produce the first phenylmethyl radical.…”
Section: Resultssupporting
confidence: 91%
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“…In this mechanism, k cage includes the rate constant for radical-pair intersystem crossing and we assume that k Ϫcage is the same for the carbonylated and decarbonylated radical pairs due to their similar size. The singlet excited state of MeDBK (τ = 3.6 × 10 Ϫ9 s at 295 K in benzene 17 ) undergoes intersystem crossing quantitatively to the triplet state (k ISC = 3.3 × 10 8 s Ϫ1 in benzene 24 ). The triplet then suffers an α-cleavage within 10 Ϫ10 s, 17 followed by decarbonylation of the arylacetyl portion [for phenylacetyl at 295 ± 1 K, k ϪCO = 6.4 × 10 6 s Ϫ1 in isooctane, 25 6.0 × 10 6 s Ϫ1 in cyclohexane, (5.3-7.3) × 10 6 s Ϫ1 in hexane, 26,27 and (1.7-2.5) × 10 6 s Ϫ1 in acetonitrile 26,27 ].…”
Section: Photochemistry In Isotropic Mediamentioning
confidence: 99%