Direct detection and reactivity of the short-lived phenyloxenium ion

Patrick J. Hanway, Jiadan Xue, Ujjal Bhattacharjee, Maeia J. Milot, Zhu Ruixue, David Lee Phillips, Arthur H. Winter

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Photolysis of protonated phenylhydroxylamine was studied using product analysis, trapping experiments, and laser flash photolysis experiments (UV-vis and TR3 detection) ranging from the femtosecond to the microsecond time scale. We find that the excited state of the photoprecursor is followed by two species: a longer-lived transient (150 ns) that we assign to the phenoxy radical and a shorter-lived (3-20 ns) transient that we assign to the singlet phenyloxenium ion. Product studies from photolysis of this precursor show rearranged protonated o-/p-aminophenols and solvent water adducts (catechol, hydroquinone) and ammonium ion. The former products can be largely ascribed to radical recombination or ion recombination, while the latter are ascribed to solvent water addition to the phenyloxenium ion. The phenyloxenium ion is apparently too short-lived under these conditions to be trapped by external nucleophiles other than solvent, giving only trace amounts of o-/p-chloro adducts upon addition of chloride trap. Product studies upon thermolysis of this precursor give the same products as those generated from photolysis, with the difference being that the ortho adducts (o-aminophenol, hydroquinone) are formed in a higher ratio in comparison to the photolysis products.

Original languageEnglish (US)
Pages (from-to)9078-9082
Number of pages5
JournalJournal of the American Chemical Society
Volume135
Issue number24
DOIs
StatePublished - Jun 19 2013

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