model lignin compound
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2012 ◽  
Vol 48 (4) ◽  
pp. 355-358 ◽  
Author(s):  
Yu. V. Titova ◽  
V. G. Stokozenko ◽  
E. L. Aleksakhina ◽  
A. I. Maksimov

2007 ◽  
Vol 46 (25) ◽  
pp. 8652-8656 ◽  
Author(s):  
Suresh Bhargava ◽  
Harit Jani ◽  
James Tardio ◽  
Deepak Akolekar ◽  
Manh Hoang

1994 ◽  
Vol 72 (1) ◽  
pp. 35-41 ◽  
Author(s):  
L.R.C. Barclay ◽  
G.R. Cromwell ◽  
J.W. Hilborn

α-Guaiacoxylacetoveratrone, 1, was selected as a model of a lignin structure component for photolysis and free radical spin trapping studies. The 3,4-dimethoxyphenacyl radical, Ar-COĊH2, 2, thermally generated from α-bromoacetoveratrone with trimethyltin, was spin trapped by phenyl-tert-butylnitrone (PBN), and the spin-trapped radical identified by ESR and mass spectroscopy. Spin trapping by PBN of radical photoproducts from 1 gave a mixture of trapped radicals, according to ESR. These were separated as their hydroxylamines and identified by liquid chromatography/mass spectroscopy (LC/MS) under chemical ionization (CI) conditions. This LC/MS (CI) method identified the same phenacyl fragment, 2 (reduced), as well as a fragment tentatively attributed to a spin-trapped guaiacoxyl radical, chemically reduced to the hydroxylamine. Extended direct photolysis of 1 yields colored paramagnetic oligomers. The synthesis of 1-(3,4-dimethoxyphenyl)-2-(4-hydroxy-3-methoxyphenylethanone(10), a rearranged, recombination photoproduct of 1, is described. A pathway for formation of oligomers as unstable dimers of 10 is presented.


FEBS Letters ◽  
1993 ◽  
Vol 323 (1-2) ◽  
pp. 135-140 ◽  
Author(s):  
Eiji Masai ◽  
Yoshihiro Katayama ◽  
Sachiko Kubota ◽  
Shinya Kawai ◽  
Makari Yamasaki ◽  
...  

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