Profiling of the formation of lignin-derived monomers and dimers from <i>Eucalyptus</i> alkali lignin
作者:Chengke Zhao、Zhenhua Hu、Lanlan Shi、Chen Wang、Fengxia Yue、Suxiang Li、Han Zhang、Fachuang Lu
DOI:10.1039/d0gc01658f
日期:——
with the aid of evidence from authenticated compounds, a great treasure trove of lignin-derived phenolic compounds from Eucalyptus alkali lignin were disclosed. Except for some common monomeric products, as many as 15 new lignin-derived monomers and dimers including syringaglycerol, diarylmethane, 1,2-diarylethanes, 1,2-diarylethenes, (arylvinyl ether)-linked arylglycerol dimers and isomeric syringaresinols
LONSKY L.; LONSKY W.; KRATZL K.; FALKEHAG I., MONATSH. CHEM. <MOCH-AP>, 1976, 107, NO 3, 685-695
作者:LONSKY L.、 LONSKY W.、 KRATZL K.、 FALKEHAG I.
DOI:——
日期:——
Ammonia chemical ionization mass spectrometry of substituted phenylpropanoids and phenylalkyl phenyl ethers
作者:Erik R. E. van der Hage、Tina L. Weeding、Jaap J. Boon
DOI:10.1002/jms.1190300404
日期:1995.4
The ammonia chemical ionization (NH3/CI) spectra of phenylpropanoids and substituted phenylalkyl phenyl ethers containing α-hydroxy or α-carbonyl functional groups are discussed. Fragmentation reactions which occur in the temperature range 180–450°C are examined to model pyrolysis mass spectrometric experiments of lignin. Hydroxycinnamyl alcohols and α-hydroxy phenylalkyl phenyl ethers show abundant [M + H − H2O]+ elimination ions and to a lesser extent [M + NH4 − H2O]+ substitution ions while hydroxycinnamic acids and α-carbonyl phenylalkyl phenyl ethers show predominantly [M + H]+ and [M + NH4]+ ions. The interpretation of functional group information is facilitated by using trideuterioammonia (ND3) and [15N] ammonia (15NH3) as reagent gases. Labile hydrogens undergo essentially complete exchange upon ND3/CI and the number of hydroxyl functional groups is readily determined by comparison of the [M + NH4]+ and [M − nH + nD + ND4]+ adduct ions. Incomplete HD exchange is observed for enolizable and aromatic protons.