41084-91-7Relevant academic research and scientific papers
Photoelectron Spectroscopy of CCO- and HCCO-
Oakes, John M.,Jones, Mark E.,Bierbaum, Veronica M.,Ellison, G. Barney
, p. 4810 - 4815 (1983)
Using negative ion photoelectron spectroscopy we have measured the electron affinities (EA) of CCO and HCCO.We find EA(CCO) = 1.848 +/- 0.027 eV and EA(HCCO) = 2.350 +/- 0.020 eV.In separate experiments with a flowing afterglow device, we have determined the gas-phase acidity of ketene and report it as ΔH0acid(CH2CO) = 365 +/- 2 kcal/mol.These data afford the ketene bond dissociation energy, DH0298(H-CHCO) = 105.9 +/- 2.1 kcal/mol, and the heats of formation: ΔHf0298(HCCO) = 42.4 +/- 2.1 kcal/mol and ΔHf0298(HCCO-) = -13.3 +/- 2.1 kcal/mol.
Unimolecular rearrangements of carbanions in the gas phase. 2. Cyclopropyl anions
Chou, Phillip K.,Dahlke, Gregg D.,Kass, Steven R.
, p. 315 - 324 (2007/10/02)
We have examined the gas-phase unimolecular rearrangements of a series of substituted cyclopropyl anions (CHXCH2CY-; X - H, Y = Ph, CHO, and CM; X = Y = CO2CH3) with a variable temperature flowing afterglow device. The ring-opening barriers range from 19 to ≥36 kcal mol-1 and are well reproduced by ab initio molecular orbital calculations. An analysis of eight monosubstituted cyclopropyl anions reveals that the flexibility (ease of inversion) and thermodynamic stability of these ions account for their tendency to isomerize.
Product Branching in Infrared Multiple Photon Decomposition of Gas-Phase Ions. Mechanistic Implications for Proton-Transfer Reactions
Moylan, Christopher R.,Jasinski, Joseph M.,Brauman, John I.
, p. 1934 - 1940 (2007/10/02)
Negative ions that lie on potential surfaces for proton-transfer reactions have been photolyzed in the gas phase with an infrared laser.The relative photodissociation yields of reactants and products of the proton-transfer reactions as well as the kinetics of the reactions themselves have been measured.The results provide details about the potential surfaces, mechanisms. and theoretical theromochemistry of these reactions.
