Journal or Book Title
Journal of the American Chemical Society
We have regiospecifically generated the α,2-, α,3-, and α,4-dehydrophenoxide anions by collisional activation of o-, m-, and p-nitrobenzoate. The α,2 and α,4 isomers also were synthesized by reacting o-benzyne radical anion with carbon dioxide and electron ionization ofp-diazophenol. All three dehydrophenol radical anions were differentiated from each other and identified by probing their chemical reactivity with several reagents. Each isomer was converted to phenoxide and its corresponding quinone as well. Thermochemical measurements were carried out on all three radical anions and their hydrogen-atom affinities, proton affinities, and electron binding energies are reported. These measured quantities are combined in thermodynamic cycles to derive the heats of formation of each of the radical anions and their corresponding carbenes (i.e., α,2-, α,3-, and α,4-dehydrophenol). These results are compared to MCQDPT2, G3, G2+(MP2), and B3LYP calculations and experimental data for appropriate reference compounds.
American Chemical Society
Reed, Dana R.; Hare, Michael C.; Fattahi, Alireza; Chung, Gyusung; Gordon, Mark S.; and Kass, Steven R., "α,2-, α,3-, and α,4-Dehydrophenol Radical Anions: Formation, Reactivity, and Energetics Leading to the Heats of Formation of α,2-, α,3-, and α,4-Oxocyclohexadienylidene" (2003). Chemistry Publications. 424.