US 11,236,119 B2Granted

Chemically stable lignin derivative and method for preparing same

AssigneesInstitut National de Recherche Pour l'Agriculture, l'Alimentation et Environnement, Institut National D'Enseignement Superieur Pour L'agriculture, L'alimentation Et L'environnement

InventorsLaurent Roumeas, Guillaume Billerach, Eric Dubreucq, Hélène Fulcrand

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Abstract

A lignin derivative including a unit of general formula (I): in which R1, R2, R3 and R4, which may be identical or different, each represent a hydrogen atom, a methoxy group —OMe, a hydroxyl group, where appropriate protected by a protective group of a hydroxyl function, or a unit R5 represents a hydrogen atom, a protective group of a hydroxyl function or a unit; A represents an oxygen atom, a sulfur atom, an —NH group or an —NR′ group; and R′1, R′2, R′3 and R′4 each represent a hydrogen atom or a substituent not including a mesomeric-effect electron-withdrawing group conjugated to the aromatic ring, a substituent from R′1, R′2, R′3 and R′4 representing the covalent bond with the benzylic carbon.

Claims18

Dependent claims

A lignin derivative comprising a unit having the general formula (I):

in which:
R1, R2, R3 and R4, which may identical or different, each represent a hydrogen atom, an —OMe methoxy group, a hydroxyl group, optionally protected by a hydroxyl-protecting group, or a
motif,
R5 represents a hydrogen atom, a hydroxyl-protecting group or a
motif,
A represents a sulfur atom or an —NR′ group, where R′ represents a hydrogen atom or a substituent not including any mesomeric-effect electron-withdrawing group conjugated to the aromatic ring,
R′1, R′2, R′3 and R′4, which may be identical or different, each represent a hydrogen atom or a substituent not including any mesomeric-effect electron-withdrawing group conjugated to the aromatic ring,
one substituent among R′1, R′2, R′3 and R′4 representing the covalent bond with the benzylic carbon,
or one of the salts thereof.

6 more elements

Dependencies are inferred from the claim text.