Spectroscopic and quantum chemical investigation of enol-enol tautomerism of 2-acetyltetronic acid

Avakyan, V. G.; Gromak, V. V.; Yatsenko, A. E.; Щеголихин, А. Н.; Kubasova, N. A.

doi:10.1007/bf00707043

Cited by 5 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is valid not only for the oxidised residual lignin structures but also for the oxidized structures derived from carbohydrates 16. On the other hand, the band at 1522 ± 2 cm −1 is always present in aromatic units conjugated with carbonyl groups (models 2–4 ) and can be assigned to their enolic configuration 17. The signals at ca 1470–1480 cm −1 are assigned to 2‐furancarboxylic acid derivatives.…”

Section: Resultsmentioning

confidence: 61%

See 1 more Smart Citation

UV‐resonance Raman micro‐spectroscopy to assess residual chromophores in cellulosic pulps

Loureiro

Fernandes

Furtado³

et al. 2010

J Raman Spectroscopy

View full text Add to dashboard Cite

Ultraviolet-resonance Raman (UV-RR) micro-spectroscopy is an appropriate and sensitive tool to assess the chromophore structures in bleached cellulosic pulps used for papermaking. The particular selectivity in detection and identification of chromophores in pulps is achieved by acquiring the UV-RR spectra in the solid state with laser excitation at 325 nm. This wavelength corresponds to absorption of poly-unsaturated chromophore structures in partially bleached/fully bleached pulps, and linearly correlated with the signal at ca 1600 cm −1 in the UV-RR spectra. The characteristic vibrations from particular pulp chromophore structures have been assigned from experiments with model compounds, thus allowing the establishment of a UV-RR database. Among the components of bleached pulp, the xylan-lignin complex was suggested to be an important source of chromophores. The monitoring of pulp bleaching by UV-RR allowed us to suggest that it is the formation of new polysaccharide-derived chromophores upon bleaching that hinders development of further brightness and is co-responsible for the brightness reversion of fully bleached pulps.

show abstract

Section: Resultsmentioning

confidence: 61%

“…[16] On the other hand, the band at 1522 ± 2 cm −1 is always present in aromatic units conjugated with carbonyl groups (models 2-4) and can be assigned to their enolic configuration. [17] The signals at ca 1470-1480 cm −1 are assigned to 2-furancarboxylic acid derivatives.…”

Section: Resultsmentioning

confidence: 99%