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@ARTICLE{Zhang:837917,
author = {Zhang, Chaofeng and Li, Hongji and Lu, Jianmin and Zhang,
Xiaochen and MacArthur, Katherine and Heggen, Marc and Wang,
Feng},
title = {{P}romoting {L}ignin {D}epolymerization and {R}estraining
the {C}ondensation via an {O}xidation-{H}ydrogenation
{S}trategy},
journal = {ACS catalysis},
volume = {7},
number = {5},
issn = {2155-5435},
address = {Washington, DC},
publisher = {ACS},
reportid = {FZJ-2017-06687},
pages = {3419 - 3429},
year = {2017},
abstract = {For lignin valorization, simultaneously achieving the
efficient cleavage of ether bonds and restraining the
condensation of the formed fragments represents a challenge
thus far. Herein, we report a two-step
oxidation–hydrogenation strategy to achieve this goal. In
the oxidation step, the O2/NaNO2/DDQ/NHPI system selectively
oxidizes CαH–OH to Cα═O within the β-O-4 structure.
In the subsequent hydrogenation step, the α-O-4 and the
preoxidized β-O-4 structures are further hydrogenated over
a NiMo sulfide catalyst, leading to the cleavage of
Cβ–OPh and Cα–OPh bonds. Besides the transformation of
lignin model compounds, the yield of phenolic monomers from
birch wood is up to $32\%$ by using this two-step strategy.
The preoxidation of CαH–OH to Cα═O not only weakens
the Cβ–OPh ether bond but also avoids the condensation
reactions caused by the presence of Cα+ from
dehydroxylation of CαH–OH. Furthermore, the NiMo sulfide
prefers to catalyze the hydrogenative cleavage of the
Cβ–OPh bond connecting with a Cα═O rather than
catalyze the hydrogenation of Cα═O back to the original
CαH–OH, which further ensures and utilizes the advantages
of preoxidation.},
cin = {ER-C-1},
ddc = {540},
cid = {I:(DE-Juel1)ER-C-1-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000401054300041},
doi = {10.1021/acscatal.7b00148},
url = {https://juser.fz-juelich.de/record/837917},
}