scholarly journals Data-Driven Advancement of Homogeneous Nickel Catalyst Activity for Aryl Ether Cleavage

ACS Catalysis ◽  
2020 ◽  
Vol 10 (13) ◽  
pp. 7021-7031 ◽  
Author(s):  
Manuel Cordova ◽  
Matthew D. Wodrich ◽  
Benjamin Meyer ◽  
Boodsarin Sawatlon ◽  
Clémence Corminboeuf
Keyword(s):  
Nickel Catalyst ◽  
Catalyst Activity ◽  
Data Driven ◽  
Aryl Ether ◽  
Ether Cleavage

scholarly journals Structural and Biochemical Characterization of the Early and Late Enzymes in the Lignin β-Aryl Ether Cleavage Pathway fromSphingobiumsp. SYK-6

2016 ◽  
Vol 291 (19) ◽  
pp. 10228-10238 ◽  
Author(s):  
Jose Henrique Pereira ◽  
Richard A. Heins ◽  
Daniel L. Gall ◽  
Ryan P. McAndrew ◽  
Kai Deng ◽  
...  
Keyword(s):  
Biochemical Characterization ◽  
Aryl Ether ◽  
Ether Cleavage

Effect of adding CaO to ZrO2 support on nickel catalyst activity in dry reforming of methane

2009 ◽  
Vol 358 (2) ◽  
pp. 215-223 ◽  
Author(s):  
Jorge D.A. Bellido ◽  
José E. De Souza ◽  
Jean-Claude M’Peko ◽  
Elisabete M. Assaf
Keyword(s):  
Nickel Catalyst ◽  
Catalyst Activity ◽  
Dry Reforming ◽  
Dry Reforming Of Methane

scholarly journals A study of catalytic actions at solid surfaces. Part XI.—The action of alumina and certain other oxides in promoting the activity of nickel catalyst

1923 ◽  
Vol 103 (723) ◽  
pp. 586-597 ◽  
Keyword(s):  
General Theory ◽  
Nickel Catalyst ◽  
Catalyst Activity ◽  
Solid Surfaces ◽  
Metallic Oxides ◽  
Specific Instance ◽  
Mechanical Explanation ◽  
Viii And Ix ◽  
Increased Activity

We have already indicated the undesirability of any general theory to explain promotor action in the case of catalyst activity, preferring to investigate each specific instance. In the cases previously studied (Parts VIII and IX) the increased activity in presence of the promotor has been ascribed to causes essentially chemical rather than physical; in the examples now described, namely, alumina and certain other metallic oxides, it will be shown that a simple mechanical explanation, the development of greater surface, is most in harmony with the observed facts.

scholarly journals Roles of two glutathione S-transferases in the final step of the β-aryl ether cleavage pathway in Sphingobium sp. strain SYK-6

2020 ◽  
Author(s):  
Yudai Higuchi ◽  
Daisuke Sato ◽  
Naofumi Kamimura ◽  
Eiji Masai
Keyword(s):  
Aromatic Compounds ◽  
Specific Activity ◽  
Value Added ◽  
Degradation Process ◽  
Lignin Biodegradation ◽  
Aryl Ether ◽  
Ether Linkage ◽  
Ether Cleavage ◽  
Subsequent Degradation ◽  
Glutathione S Transferases

ABSTRACTSphingobium sp. strain SYK-6 is an alphaproteobacterial degrader of lignin-derived aromatic compounds, which can degrade all the stereoisomers of β-aryl ether-type compounds. SYK-6 cells convert four stereoisomers of guaiacylglycerol-β-guaiacyl ether (GGE) into two enantiomers of α-(2-methoxyphenoxy)-β-hydroxypropiovanillone (MPHPV) through GGE α-carbon atom oxidation by stereoselective Cα-dehydrogenases encoded by ligD, ligL, and ligN. The ether linkages of the resulting MPHPV enantiomers are cleaved by stereoselective glutathione S-transferases (GSTs) encoded by ligF, ligE, and ligP, generating (βRβS)-α-glutathionyl-β-hydroxypropiovanillone (GS-HPV) and guaiacol. To date, it has been shown that the gene products of ligG and SLG_04120 (ligQ), both encoding GST, catalyze glutathione removal from (βRβS)-GS-HPV, forming achiral β-hydroxypropiovanillone. In this study, we characterized the enzyme properties of LigG and LigQ and elucidated their roles in β-aryl ether catabolism. Purified LigG showed an approximately 300-fold higher specific activity for (βR)-GS-HPV than that for (βS)-GS-HPV, whereas purified LigQ showed an approximately six-fold higher specific activity for (βS)-GS-HPV than that for (βR)-GS-HPV. Analyses of mutants of ligG, ligQ, and both genes revealed that SYK-6 converted (βR)-GS-HPV using both LigG and LigQ, whereas only LigQ was involved in converting (βS)-GS-HPV. Furthermore, the disruption of both ligG and ligQ was observed to lead to the loss of the capability of SYK-6 to convert MPHPV. This suggests that GSH removal from GS-HPV catalyzed by LigG and LigQ, is essential for cellular GSH recycling during β-aryl ether catabolism.IMPORTANCEThe β-aryl ether linkage is most abundant in lignin, comprising 45%–62% of all intermonomer linkages in lignin; thus, cleavage of the β-aryl ether linkage together with the subsequent degradation process is considered the essential step in lignin biodegradation. The enzyme genes for β-aryl ether cleavage are useful for decomposing high-molecular-weight lignin, converting lignin-derived aromatic compounds into value-added products, and modifying lignin structures in plants to reduce lignin recalcitrance. In this study, we uncovered the roles of the two glutathione S-transferase genes, ligG and ligQ, in the conversion of GS-HPV isomers, which are generated in the β-aryl ether cleavage pathway in SYK-6. Adding our current results to previous findings allowed us to have a whole picture of the β-aryl ether cleavage system in SYK-6.

Mechanistic Study of a Ru-Xantphos Catalyst for Tandem Alcohol Dehydrogenation and Reductive Aryl-Ether Cleavage

ACS Catalysis ◽  
2013 ◽  
Vol 3 (5) ◽  
pp. 963-974 ◽  
Author(s):  
Stephen C. Chmely ◽  
Seonah Kim ◽  
Peter N. Ciesielski ◽  
Gonzalo Jiménez-Osés ◽  
Robert S. Paton ◽  
...  
Keyword(s):  
Mechanistic Study ◽  
Aryl Ether ◽  
Ether Cleavage ◽  
Alcohol Dehydrogenation

Methyl aryl ether cleavage in benzazole syntheses in polyphosphoric acid

1970 ◽  
Vol 35 (9) ◽  
pp. 3147-3149 ◽  
Author(s):  
Charles M. Orlando ◽  
J. G. Wirth ◽  
D. R. Heath
Keyword(s):  
Polyphosphoric Acid ◽  
Aryl Ether ◽  
Ether Cleavage
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