76246-81-6Relevant articles and documents
Domino lignin depolymerization and reconnection to complex molecules mediated by boryl radicals
Hong, Longcheng,Pfeiffer, Janin,Spielmeyer, Astrid,Wegner, Hermann A.
, p. 3008 - 3014 (2020/06/17)
Chemical degradation of lignin has attracted increasing interest due to its potential for producing chemicals from renewable resources. Herein, we present a new transition metal free degradation procedure utilizing DDQ-oxidation and boryl radical mediated degradation, followed by reconnection of a monomer intermediate to a new dimer in a domino process. Our results include the selective degradation of oxidized β-O-4 model compounds by a boryl radical initiated with a catalytic amount of 4-(4-pyridinyl)benzonitrile and bispinacolborane B2(pin)2 as well as its application to organosolv lignin. This sequential procedure expands the toolbox for lignin degradation from simple depolymerization to high-value products by incorporating bond forming transformations within the process, and also provides a new transition-metal free method for the construction of 1,6-diketone fragments.
VO(acac)2 catalyzed oxidative deprotection of oximes, hydrazones, and semicarbazones
De, Surya Kanta
, p. 4409 - 4415 (2007/10/03)
Oximes, hydrazones, and semicarbazones undergo facile deprotection in the presence of a catalytic amount of vanadyl acetylacetonate and hydrogen peroxide in acetone at room temperature.