C–O bond cleavage
Electronic and bite angle effects in catalytic C O bond cleavage of a lignin model compound using ruthenium xantphos complexes
... various C-‐O and C-‐C linkages to give, e.g., the β-‐ O-‐4, β-‐β, and β-‐5 ...structure. Cleavage of these linkages in combination with further catalytic upgrading steps ...
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Late Transition Metals Supported by Aryl Ethers and Phenoxides Bearing Pendant Phosphines: Mechanistic Insights Relevant to Ether C O Bond Cleavage
... (6) (a) Empsall, H. D.; Hyde, E. M.; Jones, C. E.; Shaw, B. L. J. Chem. Soc., Dalton Trans. 1974 , 1980-1985; (b) van der Boom, M. E.; Liou, S.-Y.; Ben-David, Y.; Vigalok, A.; Milstein, D. Angew. Chem. Int. Ed. ...
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OXAZIRIDINE (C-CH3NO), C-CH2NO RADICALS AND CL, NH2 AND METHYL DERIVATIVES OF OXAZIRIDINE; STRUCTURES AND QUANTUM CHEMICAL PARAMETERS
... natural bond orbital occupancies of oxaziridine and related radicals are presented in Table S4 (Supplementary ...N-O bond have π character and this bond strengthen in comparison with ...
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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
... Identification of reaction products of compound II Figure 7 shows the HPLC chromatograms of solutions 1, 5, and 6 in the reaction of compound II at 160 °C for 120 min. The period before retention time of 10 min is ...
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Hyperthermal H2 Induced C–H Bond Cleavage: A Novel Approach To Cross-linking Of Organic Molecules
... a C–H bond of an alkane molecule is typically exothermal or energy-neutral but has a transition energy barrier of about ...300 o C, the same result can be obtained in about ...selective ...
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Highly selective cleavage C–O ether bond of lignin model compounds over Ni/CaO–H-ZSM-5 in ethanol
... The bond energy of C–O in methoxy group is 247 kJ/mol, which is the weakest in guaiacol, while the bond energies of C–O in phenolic hydroxyl group so high that difficult to break ...
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Chemo-, Diastero-, and Regioselective C−c and C−o Bond formation via Transition Metal Catalysis
... With our optimized conditions (entry 13, Table 1), we examined the substrate scope of the arylation of allylbenzene with aryl bromides (Table 2). The DCCP showed excellent reactivity with aryl bromides possessing ...
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Palladium-Catalyzed C-C Bond and C-S Bond Forming Reactions of Sulfoxides
... including cleavage and formation of C–S ...110 o C to 80 o C (Scheme 2-6A) in the reaction of benzyl phenyl sulfoxide ...
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Enzyme-catalyzed C–F bond formation and cleavage
... of nucleocidin 1 and identified the genes encoding the biosynthesis of the 5 ′ -O-sulfamate group of the nucleoci- din 1 (Zhu et al. 2015). In the next year, O’Hagan’s group provided the first biosynthetic data on ...
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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
... as rapid as that of the corresponding threo isomers in the range of the employed reaction temperatures (130–170 °C) [1]. Although it had generally been accepted that the rate of the erythro isomer was about four ...
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THE NATURE OF THE Co-C BOND CLEAVAGE PROCESSES IN METHYLCOB(II)ALAMIN AND ADENOSYLCOB(III)ALAMIN
... Co-C bond and Co-N ax bond lengths with about ...Co-C bond dissociation enthalpy and much faster bond cleavage rate for the one-electron reduced methylcobalamin radical ...
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MINDO/3 EVALUATION OF BOND ORDER AND BOND LENGTH IN SOME HETRO-DI-SUBSTITUTED BENZENES
... total bond order were obtained by summing the and components. The -bond orders were taken directly from the matrix P as they were unaffected by the similarity ...The bond lengths were computed ...
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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
... A common non-phenolic b-O-4 type dimeric lignin model compound I was subjected to nitrogen- and oxygen-alkali treatments in the absence and presence of the generator of AOS, compound VI. Figure 4 shows the yields ...
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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
... [mean value 2.0783 (16) A ˚ ] and Pd—Cl [mean value 2.336 (12) A ˚ ] bond lengths fall in the range of typical distances found in similar types of Pd II complexes. The five-membered heterocyclic rings each have a ...
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The Multicomponent Synthesis of Pyrroles from Cylcopropane S Using a One Pot Pd(0) Catalyzed Dehydrocarbonylation Protocol
... Previous work done by the Kerr group has shown that tetrahydro-1,2-oxazines can be efficiently synthesized using a three component coupling reaction between a hydroxylamine, aldehyde and cyclopropane diester. This ...
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The regioselective hydrogenation of acrylic acids using rhodium mixed anhydride catalyst precursors
... = C R 'R ")(P P h 3 )(Ph 2 P 0 2 CCR = C R 'R ")l with R, R ' and R " arising from the substrate acrylic acid, not necessarily from the catalyst ...double bond of the mixed anhydride and ...
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Quantum Chemical Description of Influence of the R Groups on Formation of Peptide Bond
... peptide bond by quantum-chemi- cal method of density functional theory (DFT) is carried ...peptide bond has been ...peptide bond is increased as a result of 1) decrease of the CO and NH bond ...
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Kinetic study on Induced Electron Transfer Reaction in Pentaamminecobalt(III) complexes of α hydroxy acids by Permonosulphuric acid in micellar medium
... The kinetics of one electron transfer route seems to be unavailable for PMS with Cobalt(III) bound and unbound complexs of α -Hydroxy acids in micellar medium, PMS oxidizes Cobalt(III) bound and unbound α -Hydroxy acids. ...
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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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Terminal uranium(V/VI) nitride activation of carbon dioxide and carbon disulfide: factors governing diverse and well defined cleavage and redox reactions
... uranium(V) or direct [2+2] cycloaddition for uranium(VI). Irrespective of this, carbamate-type species are ultimately formed which then engage in multiple bond-metathesis steps, which may or may not involve redox ...
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