1224199-09-0Relevant articles and documents
CHEMICALLY STABLE LIGNIN DERIVATIVE AND METHOD FOR PREPARING SAME
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Paragraph 0148-0150; 0165-0179, (2020/12/19)
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.
Organocatalyzed Friedel-Crafts arylation of benzylic alcohols
McCubbin, J. Adam,Krokhin, Oleg V.
supporting information; experimental part, p. 2447 - 2449 (2010/07/04)
Electron-rich aromatic and heteroaromatic rings are functionalized directly with a variety of benzylic alcohols under mild conditions. The reaction is catalyzed by commercially available pentafluorophenylboronic acid, which is stable under ambient conditions and recoverable. The reaction itself is highly atom economical and produces water as the only byproduct. A Friedel-Crafts mechanism is proposed.