Detection of substances with alcoholic or phenolic hydroxyl groups by generation of hydrogen peroxide with imidazole and peroxyoxalate chemiluminescence

1995 ◽  
Vol 10 (6) ◽  
pp. 339-344 ◽  
Author(s):  
Osamu Nozaki ◽  
Toshinao Iwaeda ◽  
Yoshio Kato
Keyword(s):  
Hydrogen Peroxide ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Groups ◽  
Peroxyoxalate Chemiluminescence ◽  
Phenolic Hydroxyl Groups

The Reactions of Lignins with High Temperature Hydrogen Peroxide Part 2. The Oxidation of Kraft Lignin

Holzforschung ◽  
1999 ◽  
Vol 53 (3) ◽  
pp. 277-284 ◽  
Author(s):  
J.F. Kadla ◽  
H.-m. Chang ◽  
H. Jameel
Keyword(s):  
Hydrogen Peroxide ◽  
High Temperature ◽  
Molecular Oxygen ◽  
Kraft Lignin ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Groups ◽  
Peroxide Oxidation ◽  
Alkaline Hydrogen Peroxide ◽  
Phenolic Hydroxyl Groups ◽  
Increasing Temperature

Summary A technical pine kraft lignin was subjected to alkaline hydrogen peroxide oxidation in the presence of DTMPA and molecular oxygen at various temperatures. In the presence of DTMPA the lignin was found to undergo increasing levels of oxidation and degradation with increasing temperature. At 110°C over 80% of the kraft lignin was degraded. Analyses of the degraded lignins indicated that both phenolic and nonphenolic lignin moieties were degraded. At 90°C the addition of molecular oxygen resulted in further lignin demethoxylation, but did not decrease the amount of phenolic hydroxyl groups or hydrogen peroxide consumed. In the absence of DTMPA the hydrogen peroxide was rapidly degraded, and accompanied by only minimal lignin oxidation.

Methylation of Phenolic Hydroxyl Group and Demethylation of Anisoles

2009 ◽  
Vol 2009 (4) ◽  
pp. 229-230 ◽  
Author(s):  
Nobuhiro Sato ◽  
Hiroyuki Endo
Keyword(s):  
Microwave Heating ◽  
Room Temperature ◽  
Reverse Reaction ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Group ◽  
Hydroxyl Groups ◽  
Phenolic Hydroxyl Groups ◽  
Phenyl Ethers ◽  
Methyl Phenyl

A mild methylation of phenolic hydroxyl groups with iodomethane was enabled in the presence of sodium bis(trimethylsilyl)amide at room temperature. The reverse reaction, namely demethylation of methyl phenyl ethers, was easily achieved by microwave heating with neat iodotrimethylsilane.

Fast, Easy, and Economical Quantification of Lignin Phenolic Hydroxyl Groups: Comparison with Classical Techniques

2018 ◽  
Vol 32 (5) ◽  
pp. 5969-5977 ◽  
Author(s):  
Luis Serrano ◽  
Esakkiammal Sudha Esakkimuthu ◽  
Nathalie Marlin ◽  
Marie-Christine Brochier-Salon ◽  
Gerard Mortha ◽  
...  
Keyword(s):  
Phenolic Hydroxyl ◽  
Hydroxyl Groups ◽  
Phenolic Hydroxyl Groups

Influence of phenolic hydroxyl groups on second-order optical nonlinearity at an example of 2,4- and 3,4-dihydroxyl hydrazone isomorphic crystals

2009 ◽  
Vol 130 (13) ◽  
pp. 134708 ◽  
Author(s):  
O-Pil Kwon ◽  
Mojca Jazbinsek ◽  
Jung-In Seo ◽  
Eun-Young Choi ◽  
Hoseop Yun ◽  
...  
Keyword(s):  
Optical Nonlinearity ◽  
Second Order ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Groups ◽  
Phenolic Hydroxyl Groups
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