Acidolysis mechanism of lignin from bagasse during p-toluenesulfonic acid treatment

In the presence of the amino acid (S)-(-)-proline, 1,3-dihydroxyanthraquinone (1) is alkylated by phenylacetaldehyde to give an anomeric mixture of lactols (2). The lactols are oxidized to the corresponding lactone (3) by manganese dioxide or chromic acid. Treatment of (2) with p-toluenesulfonic acid yields the expected enol ether (4) along with the substitution product (5). Mass spectrometry fragmentation, high-resolution 1H N.M.R. and 13C n.m.r, studies of these compounds are discussed.

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Insights into delignification behavior using aqueous p-toluenesulfonic acid treatment: comparison with different biomass species

Cellulose ◽

10.1007/s10570-020-03481-3 ◽

2020 ◽

Vol 27 (17) ◽

pp. 10345-10358

Author(s):

Pengfei Li ◽

Hairui Ji ◽

Liwei Shan ◽

Yuanfeng Dong ◽

Zhu Long ◽

...

Keyword(s):

Acid Treatment ◽

Treatment Comparison ◽

Toluenesulfonic Acid

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Characterization of the major isomers of substituted tetrahydro-2 H -pyrans from 1,3,5-triarylpentane-1,5-diols by p -toluenesulfonic acid treatment

Journal of Molecular Structure ◽

10.1016/j.molstruc.2017.12.030 ◽

2018 ◽

Vol 1156 ◽

pp. 684-689 ◽

Cited By ~ 1

Author(s):

Rengasamy Chithiravel ◽

Kandasamy Rajaguru ◽

Shanmugam Muthusubramanian ◽

Nattamai Bhuvanesh

Keyword(s):

Acid Treatment ◽

Toluenesulfonic Acid

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Effect of ground wood particle size on biomass fractionation using p-toluenesulfonic acid treatment

Cellulose ◽

10.1007/s10570-020-03037-5 ◽

2020 ◽

Vol 27 (7) ◽

pp. 4043-4052 ◽

Cited By ~ 1

Author(s):

Binshou Wang ◽

Peiyan Shen ◽

Wenyuan Zhu ◽

Zhiqiang Pang ◽

Cuihua Dong

Keyword(s):

Particle Size ◽

Acid Treatment ◽

Wood Particle ◽

Toluenesulfonic Acid ◽

Biomass Fractionation

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Fasciaton of Pectate Elementary Fibrils

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100070746 ◽

1973 ◽

Vol 31 ◽

pp. 60-61

Author(s):

George F. Leeper

Keyword(s):

Acid Treatment ◽

Carbon Film ◽

Final Concentration ◽

Cellulose Microfibrils ◽

Pectic Acid ◽

Elementary Fibrils

Polysaccharide elementary fibrils are usually fasciated into microfibrils of from one hundred to a few hundred Angstroms wide. Cellulose microfibrils when subjected to acid treatment dissociate into component elementary fibrils. For pectic acid it was observed that variations in pH could cause a change in the fasciation of the elementary fibrils.Solutions of purified pectic acid and sodium phosphotungtate were adjusted to various pH levels with NaOH or HCl and diluted to give a final concentration of 0.5 and 1% for the polysaccharide and negative stains respectively. Micrographs were made of the samples after drying on a carbon film covered grid. The average number of elementary fibrils was determined by counting the number of elementary fibrils in each fascicle intersected by lines drawn across the micrograph.

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