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Exploratory Laser Flash Photolysis Investigations of Diphenylcarbene Reactivity in Supercritical Fluids

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Exploratory laser flash photolysis (LFP) experiments have been performed to determine the feasibility of study of carbene chemistry in supercritical fluids (SCF's). Diphenylcarbene (Ph2C:) has been generated by 266 nm LFP of diphenyldiazomethane (Ph2CN2) in supercritical ethane, carbon dioxide and fluoroform. Diphenylcarbene was found: to react with ethane to form diphenylmethyl radical (Ph2C°H); to react with CO2 to most likely form diphenyloxiranone; and to be unreactive towards CHF3. The LFP results are discussed in terms of SCF solvent dynamics and the potential of SCF's to influence carbene reactivity.

Affiliations: 1: Radiation Laboratory, University of Notre Dame, Notre Dame, IN 46556, U.S.A.


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