3509-48-6Relevant academic research and scientific papers
Degradation of β-O-4 model lignin species by vanadium Schiff-base catalysts: Influence of catalyst structure and reaction conditions on activity and selectivity
Parker, Heather J.,Chuck, Christopher J.,Woodman, Timothy,Jones, Matthew D.
, p. 40 - 47 (2016/05/10)
In the pursuit of value-added products from the degradation of the abundant aromatic biopolymer lignin, homogeneous catalysis has the potential to provide a mild, selective route to monomeric phenols. Homogeneous vanadium catalysts have previously been shown to effectively cleave dimeric β-O-4 model lignin compounds, with selectivity for C-C or C-O cleavage, or benzylic oxidation, depending on the ligand structure and oxidation state of the metal. In this study, a systematic kinetic investigation was undertaken in order to gain further understanding of the role of ligand structure and reaction conditions on the activity of vanadium Schiff-base catalysts towards a non-phenolic β-O-4 model lignin dimer, and the selectivity of these species towards C-O bond cleavage. Catalytic activity was found to be increased by the addition of bulky, alkyl substituents at the 3′-position of the phenolate ring, whereas electron-withdrawing substituents were found to dramatically reduce activity irrespective of their size. Selective depolymerization of a phenolic β-O-4 dimer was also achieved.
Non-oxidative vanadium-catalyzed co bond cleavage: Application to degradation of lignin model compounds
Son, Sunghee,Toste, F. Dean
supporting information; experimental part, p. 3791 - 3794 (2010/08/22)
(Chemical Equation Presented) New direction: Changes In the ligand structure divert the reactivity of vanadium (V) oxo complexes from alcohol oxidation to a novel non-oxidative C-O bond cleavage. Thus, highly functionalized aryl enones can be selectively generated from lignin model compounds by vanadium-catalyzed cleavage of the β-O-4 linkage (see scheme; N blue, O red).
Oxovanadium(IV) complexes of Schiff base derived from 3-aminopropanol and derivatives of salicylaldehyde
Sarkar, Asit R.,Chakraborty, Aniruddha
experimental part, p. 167 - 170 (2009/05/26)
Oxovanadium(IV) complexes were synthsised by reacting vanadyl acetylacetonate with Schiff bases obtained by condensation of 3-aminopropanol with salicylaldehyde and its derivatives, 3-methoxysalicylaldehyde, 5-nitrosalicylaldehyde, 5-chlorosalicylaldehyde
Preparation and Characterization of a Few Coordination Compounds of Titanium(IV) with Schiff Bases
Sharma, R. K.,Singh, R. V.,Tandon, J. P.
, p. 376 - 378 (2007/10/02)
Titanium(IV) complexes of dibasic tridentate schiff bases formed by the condensation of 2,4-pentanedione, 2-hydroxyacetophenone, salicylaldehyde or 2-hydroxy-1-naphthaldehyde with 2-hydroxyethyl-, 2-hydroxy-1-propyl-, 3-hydroxy-1-propyl- and 1-hydroxy-2-b
