Suarez, Cristina published the artcileProton NMR studies of symmetrically-substituted N,N-dialkyltrifluoroacetamides: medium effects, Quality Control of 360-92-9, the publication is Journal of Physical Chemistry (1990), 94(17), 6679-83, database is CAplus.
Activation parameters characterizing the internal rotation about the C-N partial double bond in CF3CONR2 (R = Et, CHMe2, CH2CHMe2) were determined from exchange-broadened 1H NMR spectra. Gibbs energies of activation, ΔG298 (kcal mol-1), for the gaseous amides and their 1% CCl4 solutions as follows: di-Et, 16.1/17.8; diisopropyl, 15.8/16.3; diisobutyl, 16.4/17.3. In both the gas and liquid phases the rotational barriers decrease with increasing N-alkyl substituent bulk. The phase dependence of these parameters is compatible with expected solvent internal pressure effects. Lower gas-phase activation energies are consistent with a process proceeding via a transition state with greater steric requirements than the ground-state configuration.
Journal of Physical Chemistry published new progress about 360-92-9. 360-92-9 belongs to amides-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Amine,Aliphatic hydrocarbon chain,Amide, name is N,N-Diethyl-2,2,2-trifluoroacetamide, and the molecular formula is C6H4ClNO2, Quality Control of 360-92-9.
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