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Intramolecular Chain Transfer to Polymer in the Emulsion Polymerization of 2-Ethylhexyl Acrylate

“…Peak assignment is shown in Table . The assignments were derived by comparison with hector spectra of the monomer and by comparison of experimental shifts with those calculated using empirical substituent additivity parameters . They were in agreement with data previously published for this monomer .…”

Improving the Catalytic Performance of (S)-Proline as Organocatalyst in Asymmetric Aldol Reactions in the Presence of Solvate Ionic Liquids: Involvement of a Supramolecular Aggregate

“…When the SIL is mixed with ( S )-proline, the IR spectrum shows a reduction in intensity of the band at 1548 cm –1 , possibly as a consequence of a hydrogen bond interaction. On the other hand, the band at 1374 cm –1 disappears and a new intense band at 1350 cm –1 appears (Figure S2b, Supporting Information), which may be associated with the SO stretching of the Tf 2 N – anion . These changes indicate that an interaction takes place between ( S )-proline and the SIL, which is in line with the 7 Li NMR spectra (see Figure S1b, Supporting Information).…”

“…( S )-Proline alone shows three intense bands in the region between 1700 to 1300 cm –1 (Figure S2a, Supporting Information). A peak at 1612 cm –1 corresponds to the stretching of the carbonyl group, while one at 1548 cm –1 is assigned to stretching of the ammonium group in proline, and the third peak at 1374 cm –1 corresponds to the OH in-plane deformation coupled to the C–O stretching vibration . When the SIL is mixed with ( S )-proline, the IR spectrum shows a reduction in intensity of the band at 1548 cm –1 , possibly as a consequence of a hydrogen bond interaction.…”

Hetero-Diels−Alder Reactions of Homochiral 1,2-Diaza-1,3-butadienes with Diethyl Azodicarboxylate under Microwave Irradiation. Theoretical Rationale of the Stereochemical Outcome

“…The most deshielded signal appears at ∼7 ppm as a doublet, which can be attributed to H-5, the azomethine proton. Also 13 C NMR spectra were used to confirm such structures: the chemical shifts of C-1‘ to C-4‘ carbon signals are consistent with typical values found for acyclic carbohydrate skeleta, and the resonance at ∼135 ppm is characteristic of the azomethine carbon at C-5.…”