ISSN:
0009-2940
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Low Molecular Weight Degradation Products of Lignin, 1. The Degradation of Beech Lignin with Thioacetic AcidThe reaction of ground beech wood with thioacetic acid and boron trifluoride, followed by alkaline hydrolysis and reduction with Raney-nickel degrades 91% of the lignin to monomeric to tetrameric products under mild conditions. From the monomeric fraction (50% of the lignin) 1-(4-hydroxy-3,5-dimethoxyphenyl)propane (1) (24% of the lignin), 1-(4-hydroxy-3-methoxyphenyl)propane (2) (7%), pyrocatechol (3), (3%), 3-(4-hydroxy-3,5-dimethoxy-phenyl)propan-1-ol (4) (2%), and 3-(4-hydroxy-3-methoxyphenyl)propan-1-ol (5) (1,4%) are obtained as the main products.
Notes:
Durch Einwirkung von Thioessigsäure/BF3 auf Buchenholzmehl, anschließende alkalische Verseifung und Reduktion mit Raney-Nickel lassen sich 91% des Lignins unter milden Bedingungen zu monomeren bis tetrameren Phenolen abbauen. Aus der Fraktion der monomeren Abbauphenole erhält man als Hauptprodukte 1-[4-Hydroxy-3.5-dimethoxy-phenyl]-propan (1) (24% des Lignins), 1-[4-Hydroxy-3-methoxy-phenyl]-propan (2) (7%), Brenzcatechin (3) (3%), 3-[4-Hydroxy-3.5-dimethoxy-phenyl]-propanol-(1) (4) (2%) und 3-[4-Hydroxy-3-methoxy-phenyl]-propanol-(1) (5) (1.4%).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19711040626
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