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Lithium monoxide anion (LiO-) has been generated in the gas phase and is found to be a stronger base than methyl anion (CH3-). This makes LiO- the strongest base currently known, and it will be a challenge to produce a singly charged or multiply charged anion that is more basic. The experimental acidity of lithium hydroxide is ΔH°acid = 425.7 ± 6.1 kcal·mol-1 (1 kcal = 4.184 kJ) and, when combined with results of high-level computations, leads to our best estimate for the acidity of 426 ± 2 kcal·mol-1. [ABSTRACT FROM AUTHOR]

Examines the formation of dodecahedryl anion and the determination of the acidity and carbon-hydrogen (C-H) bond dissociation energy of dodecahedrane. Reaction of dodecahedrane with amide in a Fourier transform mass spectrometer; DePuy kinetic method for measuring the acidity of dodecahedrane.

The heat of hydrogenation of indenone was measured via two partially independent thermodynamic cycles by carrying out energetic measurements (i.e., electron affinities, proton affinities and ionization potentials) on both negative and positive ions (Δ H ° H 2 = 17.8 ± 5.5 and 17.5 ± 5.7 kcal mol −1 , respectively). High level G3 computations were also carried out to provide the heats of formation of indenone (16.8 kcal mol −1 ) and cyclopentadienone (14.0 kcal mol −1 ). These 4 n π electron systems are found to be nonaromatic in contrast to previous views. A recent report on cyclopropenyl anion (J. Org. Chem. 2013, 78, 7370–7372) indicates that this ion is also nonaromatic, and suggests that NMR ring currents and nucleus independent chemical shift (NICS) calculations do not correlate with the energetic criterion for antiaromatic compounds. [ABSTRACT FROM AUTHOR]

The heat of hydrogenation of indenone was measured via two partially independent thermodynamic cycles by carrying out energetic measurements (i.e., electron affinities, proton affinities and ionization potentials) on both negative and positive ions (ΔH°H2 = 17.8 ± 5.5 and 17.5 ± 5.7 kcal mol-1, respectively). High level G3 computations were also carried out to provide the heats of formation of indenone (16.8 kcal mol-1) and cyclopentadienone (14.0 kcal mol-1). These 4n π electron systems are found to be nonaromatic in contrast to previous views. A recent report on cyclopropenyl anion (J. Org. Chem. 2013, 78, 7370-7372) indicates that this ion is also nonaromatic, and suggests that NMR ring currents and nucleus independent chemical shift (NICS) calculations do not correlate with the energetic criterion for antiaromatic compounds. [ABSTRACT FROM AUTHOR]