Graham, Laurine L. published the artcileChemical shift assignments in N,N-disubstituted trifluoroacetamides, Computed Properties of 360-92-9, the publication is Organic Magnetic Resonance (1972), 4(2), 335-42, database is CAplus.
Due to hindered rotation about the central C-N bond in N,N-disubstituted trifluoroacetamides, CF3CONR1R2, two resonance peaks are usually observed for each proton in R1 and R2. Chem. shift assignments are made for the following amides: R1 = R2 = Me; R1 = R2 = Et; R1 = Me, R2 = Me2CH; R1 = Me, R2 = Bu; R1 = Me, R2 = cyclohexyl; R1 = R2 = Me2CH; R1 = Me2CH, R2 = cyclohexyl. Amides, where R1 = R2 = Me2CH and R1 = Me2CH, R2 = cyclohexyl, show an inversion of the relative chem. shift for both the methine and methyl protons of the 2-propyl group as compared with the amide where R1 = Me, R2 = Me2CH. For non-fluorinated amides, aromatic solvents shift the trans alkyl peaks to higher field faster than those cis (to the carbonyl oxygen atom); however, this generalization does not apply to all trifluoroacetamide proton peaks.
Organic Magnetic Resonance 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 C6H10F3NO, Computed Properties of 360-92-9.
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https://en.wikipedia.org/wiki/Amide,
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