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.

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.

Abstract: A compound of general formula (I) in which R1, R2, R3 and R5, identical or different, each represent a hydrogen atom or a hydroxyl group, optionally protected by a protecting group. R4 represents a hydrogen atom or an —OR7 group, in which R7 represents a hydrogen atom, a protecting group or a gallate group. R6 represents a hydroxyl group, optionally protected by a protecting group. R?1, R?2, R?3 and R?4, identical or different, each represent a hydrogen atom or a substituent not comprising a mesomeric electron withdrawing group conjugated with the furan ring. A substituent from R?1, R?2, R?3 and R?4 representing the covalent bond with the pyran ring or one of the salts of same. A method for obtaining such a compound includes a step of depolymerization of condensed tannins in the presence of an acid by means of a nucleophile derived from furan.

Abstract: A compound has at least one epoxide function which can be synthesized by an epoxidation reaction of a compound having at least one hydroxyl function obtained by depolymerization of condensed tannins by a nucleophile selected from furan and the derivatives thereof. The compound having at least one epoxide function has properties that are useful in the production of epoxy resins, as a synthon precursor and/or as a starting material for forming a polyamine hardener.

Abstract: A compound of general formula (I) in which R1, R2, R3 and R5, identical or different, each represent a hydrogen atom or a hydroxyl group, optionally protected by a protecting group. R4 represents a hydrogen atom or an —OR7 group, in which R7 represents a hydrogen atom, a protecting group or a gallate group. R6 represents a hydroxyl group, optionally protected by a protecting group. R?1, R?2, R?3 and R?4, identical or different, each represent a hydrogen atom or a substituent not comprising a mesomeric electron withdrawing group conjugated with the furan ring. A substituent from R?1, R?2, R?3 and R?4 representing the covalent bond with the pyran ring or one of the salts of same. A method for obtaining such a compound includes a step of depolymerization of condensed tannins in the presence of an acid by means of a nucleophile derived from furan.

Abstract: The present application relates to a method for preparing epoxy resins from a mixture of epoxidized phenolic compounds, wherein said epoxidized phenolic compounds are obtained by the epoxidation of natural phenolic compounds selected from the group comprising simple phenol, acid-phenol, coumarin, naphthoquinone, stillbenoid, flavonoid, isoflavanoid, anthocyanin, condensed tannin and hydrolyzable tannin.

Abstract: The present application relates to a method for preparing epoxy resins from a mixture of epoxidized phenolic compounds, wherein said epoxidized phenolic compounds are obtained by the epoxidation of natural phenolic compounds selected from the group comprising simple phenol, acid-phenol, coumarin, naphthoquinone, stillbenoid, flavonoid, isoflavanoid, anthocyanin, condensed tannin and hydrolyzable tannin.