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- W2160637890 abstract "We investigate the gas-phase photochemistry of 5-diazo Meldrum's acid (DMA), a photoactive compound used in lithography, by femtosecond photofragment ion spectroscopy. Transient-absorption studies in solution had revealed an ultrafast intramolecular Wolff rearrangement to a ketene after UV excitation, followed by reactions which also involve the solvent. Due to the absence of solvent molecules in this gas-phase study, we are able to focus purely on the photochemistry of the Wolff rearrangement and subsequent reaction steps. The observation of the time-resolved photofragment ion signals allows us to discriminate the dynamics of ketene and carbene products. By identification of the different possible molecular origins for a certain fragment ion signal, the time scale of the Wolff rearrangement and the lifetime of the ketene product are inferred. We further identified experimental signatures of a second Wolff rearrangement emanating from the carbene product, as had been conjectured indirectly for this molecule from pyrolysis studies." @default.
- W2160637890 created "2016-06-24" @default.
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- W2160637890 date "2014-01-01" @default.
- W2160637890 modified "2023-09-25" @default.
- W2160637890 title "Ultrafast photofragment ion spectroscopy of the Wolff rearrangement in 5-diazo Meldrum's acid" @default.
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- W2160637890 doi "https://doi.org/10.1039/c3cp55365e" @default.
- W2160637890 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24618843" @default.
- W2160637890 hasPublicationYear "2014" @default.
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