Bond cleavage
Synergistic contribution of hydrosulfide and carbonate anions to the β-O-4 bond cleavage of lignin model compounds in a green liquor pretreatment for enzymatic hydrolysis of lignocellulosic materials
... hydroxy-3-methoxyphenyl)-2-(2-methoxyphenoxyl)ethene (IV, Fig. 2) and the total yield of these 3 compounds, when compound I was treated in solution 1, 2, or 3. The for- mation of compound III indicates the b-O-4 ...
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THE NATURE OF THE Co-C BOND CLEAVAGE PROCESSES IN METHYLCOB(II)ALAMIN AND ADENOSYLCOB(III)ALAMIN
... Vitamin B 12 is known to participate in at least two types of enzyme-catalyzed reactions [8-10] in the human body: a) isomerase rearrangements with participation of the adenosylcobalamin form of vitamin B 12 ; b) ...
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Hyperthermal H2 Induced C–H Bond Cleavage: A Novel Approach To Cross-linking Of Organic Molecules
... In the research and development of new reaction routes, scientists have discovered that the kinetic energy of a reactant can be an important reaction attribute. It can be used to drive a chemical reaction which otherwise ...
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Effect of type of aromatic nucleus in lignin on the rate of the β-O-4 bond cleavage during alkaline pulping process
... In the work-up procedure for all the compounds except G 0 H(Cl), the autoclave was cooled in an ice water bath and the content was neutralized with acetic acid. Methanol (2.0 ml) containing an internal standard compound, ...
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Chemospecific and Regioselective Ethereal Methyl Oxygen Bond Cleavage Behavior of Aroylated Dimethoxynaphthalenes by Combined Action of AlCl3 and Aroyl Group
... ether bond of 1-monoaroyl-2,7-di- methoxynaphthalene 1aa, the β-methyl ether bonds of 1,8-diaroyl-2,7-dimethoxynaphthalene 7aa were essen- tially unchanged indicates the plausible origination of the ...
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ATP Dependent C–F Bond Cleavage Allows the Complete Degradation of 4 Fluoroaromatics without Oxygen
... tral dearomatizing enzyme (23, 28, 29), class I BCRs catalyze de- halogenation reactions during the complete degradation of bro- minated, chlorinated, and fluorinated aromatics. The reductions of BzCoA, 3-Br-BzCoA, ...
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Electronic and bite angle effects in catalytic C O bond cleavage of a lignin model compound using ruthenium xantphos complexes
... depolymerisation, 15b,25 solubilisation, 26 liquefaction 27 or enzymatic modifications 28 should preserve the aromatic nature of the end product. In general, homogeneous catalysts can exhibit high reactivity under mild ...
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Heterobimetallic metallation studies of N,N-dimethylphenylethylamine (DMPEA) : benzylic C-H bond cleavage/dimethylamino capture or intact DMPEA complex
... by TMEDA to Li prevents the Me group from bridging between the two metals, resulting in a central acyclic but curved LiNZnC chain (Figure 7). Whilst the Zn-N(TMP) bond length in 7 [2.0482(19) Å] is the same within ...
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Revisiting the mechanism of β-O-4 bond cleavage during acidolysis of lignin IV: dependence of acidolysis reaction on the type of acid
... The reaction route of BC is decisive for the whole deg- radation process of VG. Five reaction modes are currently proposed for BC (Fig. 2). Route I is the abstraction of the β -proton by a certain base to afford signifi ...
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Molecular Structural Studies of Captopril Drug, Using Thermal Analysis, mass Spectral Fragmentation and Semi- empirical MO- Calculations
... This study provides further insights into application of experimental TA and MS techniques and theoretical investigation using PM3 procedure on KPL drug. From the application of both practical and theoretical techniques ...
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Enzyme-catalyzed C–F bond formation and cleavage
... 1965). Subsequently, other defluorinases were isolated from several micro-organisms (Goldman 1965; Kawa- saki et al. 1981; Walker and Lien 1981; Liu et al. 1998; Kurihara et al. 2003; Donnelly and Murphy 2009). The ...
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Progress of oxidation of non-phenolic lignin moiety in an oxygen bleaching process via the conversion of non-phenolic into phenolic lignin moiety
... b-O-4 bond cleavage caused by some oxidation ...b-O-4 bond cleavage, another specially designed b-O-4 type dimeric model compound, 2-(3,5- ...
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Appropriation of the ‘Witch’ Stigma as White Women's Self-Empowerment
... O-H cleavage of ethylene glycol (see Table ...C-H bond cleavage, implicit and explicit solvation models anticipate comparable solvent effects which is plausible considering that directional hydrogen ...
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Photolysis and acid cataysed studies of some bifunctional systems
... a,S-Epoxyketones have also been observed to undergo isomerisation at the epoxide carbons in a process involving C-C bond cleavage Scheme 11.. Scheme 11 undergoes acetone sensitised geome[r] ...
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Highly selective cleavage C–O ether bond of lignin model compounds over Ni/CaO–H-ZSM-5 in ethanol
... C–O bond of three model compounds cleavage in ...C–O bond cleavage at very mild conditions (140 °C, 1 MPa H 2 ...C–O bond of α-O-4 and β-O-4 could be completely cleaved within 60 ...C–O ...
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Role of magnesium ions in the reaction mechanism at the interface between Tm1631 protein and its DNA ligand
... ture (PDB: 1VPQ) does not contain any metal ions in the predicted binding site. On the other hand, there are rela- tively few crystallographically characterised magnesium binding sites [15]. For some binding sites, a ...
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Crystal structure of trans dichloridobis[N (5,5 dimethyl 4,5 dihydro 3H pyrrol 2 yl κN)acetamide]palladium(II) dihydrate
... N—O bond cleavage of oxadiazoline rings can be promoted by thermal heating to furnish the derived ketoimine complexes (Lasri et ...N—O bond cleavage to form pyrrolylbenzamide derivatives in ...
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Terminal uranium(V/VI) nitride activation of carbon dioxide and carbon disulfide: factors governing diverse and well defined cleavage and redox reactions
... size differences between uranium(V) and uranium(VI), where the former is larger so an additional ligand in the coordination sphere of uranium brings greater stability through the formation of another U−N bond with ...
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Functional Characterization of the Cleavage Specificity of the Sapovirus Chymotrypsin-Like Protease
... the cleavage efficiency and substrate specificity of the catalytic in-trans and cis activities of sapovirus NS6 and NS6-7 proteins were examined in ...scissile bond, neither in trans nor in cis, indicating ...
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Solvent dependent photobehaviour of some 2 aryl 2 bromo 1H indene 1,3(2H) diones
... the former protons relative to the latter presumably arises due to the orthogonal disposition of the p-tolyl group present on the double bond w.r.t. benzene ring of the phthalide part. However, the methyl protons ...
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