C-F bond
Enzyme-catalyzed C–F bond formation and cleavage
... of C–F bond cleavage by defluorinases has been investigated (see ...with F atom. This leads to the leaving of F atom from the ...
8
Selectivity of C-H activation and competition between C-H and C-F bond activation at fluorocarbons
... the C-F bond by two pathways (harpoon and insertion-elimination) is observed mostly with early metal atoms/ions, while later metals exhibit complex formation (termed clustering) by way of ...
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ATP Dependent C–F Bond Cleavage Allows the Complete Degradation of 4 Fluoroaromatics without Oxygen
... the C-3 position in an essentially irreversible manner, yielding dienoyl-CoA (24, ...the C–F bond, HF cannot be eliminated. Con- sequently, the 3-F-dienoyl-CoA represents a dead-end ...
9
Utilising sodium-mediated ferration for regioselective functionalisation of fluoroarenes via C-H and C-F bond activations
... To conclude, by exploiting synergistic effects in sodium ferrate chemistry, we have unveiled a new regioselective method for the direct ferration of a wide range of fluoroarenes under mild reaction conditions as well as ...
5
New approaches for C F bond formation in organic chemistry
... a C-OH to a C-F bond is accompanied by loss of the acidic hydrogen and this clearly affects the hydrogen bond donor ...of C-OH in biological systems; to determine whether the ...
242
The C F bond as a conformational probe in agonist receptor interactions
... rich C-H σ-orbital into the electron-deficient C-F anti-bonding σ* orbital, which occurs if the C-F bond is anti-periplanar to the C-H ...
194
Stereochemical outcomes of C F activation reactions of benzyl fluoride
... polar C–F bond has been utilised in activation chemistry despite its low reactivity to traditional nucleo- philes, when compared to other C–X halogen ...the C–F activation of ...
8
Stereoselective alpha fluoroamide and alpha fluoro gamma lactone synthesis by an asymmetric zwitterionic aza Claisen rearrangement
... The development of methods for the stereoselective introduc- tion of the C-F bond, α-to a carbonyl group has been a signi- ficant and recent focus in organo-fluorine chemistry.[1,2] Most effort has ...
5
Organofluorine chemistry : difluoromethylene motifs spaced 1,3 to each other imparts facial polarity to a cyclohexane ring
... Selective incorporation of fluorine atoms is a powerful strategy for modulating the properties of organic compounds [1-3]. For instance, the replacement of hydrogen by fluorine is commonly practised in medicinal [4,5] ...
5
Mechanistic study of Ru NHC catalyzed hydrodefluorination of fluoropyridines : the influence of the NHC on the regioselectivity of C–F activation and chemoselectivity of C–F versus C–H bond cleavage
... 5 F 4 HN as a minor product, but this species is then inert to any further ...of C 5 F 5 N is favored at the para-position and gives 2,3,5,6-C 5 F 4 HN as the major ...undergoes ...
12
Kinetic and mechanistic study into emission of HCl in fires of PVC
... the C-Cl and C-H cleavages at the methylenic sites with an activation enthalpy of ...a C-H fission at methylenic sites and the formation of P11, P12 and P14 moieties through activation enthalpies of ...
11
Iterative reactions of transient boronic acids enable sequential C–C bond formation
... of C-C bonds is at the heart of synthetic organic ...multiple C-C bonds using iterative or one-pot methods allows a rapid increase in molecular ...dominated C-C bond ...
20
Dalton Discussion 12: Catalytic C–H and C–X Bond Activation91-97
... regioselective C–H functionalisations including a palladium-catalysed oxidative etherification of imino- ...carbon–oxygen bond formation was presented by Jason ...
7
β D Gulose
... oxidized from lactitol by Agrobacterium tumefaciens, was reduced by chemical hydrogenation. The resulting product, D- gulosyl-(β-1, 4)-D-sorbitol containing D-gulose, was hydrolyzed by acid hydrolysis, and its subsequent ...
7
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 ...
316
Biologically active kigamicin analogues by sequential palladium catalysed C O and C C bond construction
... As described previously, current methods to THXs utilise very strong acids and harsh reaction conditions. Whilst this provides a rapid route to basic analogues containing the THX moiety, analogues with greater complexity ...
238
Palladium-Catalyzed C-C Bond Forming Reactions With Weakly Acidic C(sp3)-H Bonds
... form C-C bonds are a mainstay in the preparation of small molecules, which have applications ranging from biological studies to treatment of human ...of C-H bonds as a more efficient and ...
528
Mechanisms of C H Bond Activation by Platinum(II)
... Computational Methods. All computations were performed using the Gaussian03 software package unless otherwise stated. 4 All species were treated as singlets. Geometries were optimized by density functional theory method ...
142
Crystal structures of two bicyclo[5 1 0]octanes: potassium trans bicyclo[5 1 0]octane 4 carboxylate monohydrate and cis bicyclo[5 1 0]octan 4 yl 4 bromobenzenesulfonate
... bridgehead C—C bond length in the CSD set does not differ significantly from the other cyclopropane bond lengths, just as in the present cis- fused structure, (II), and in contrast to the ...
14
Pd catalysed C C & C O bond formation using bis (dialkyl/diarylphosphino)ferrocene ligands
... A novel protocol has been developed for the synthesis of aryl-alkyl ethers via C-O bond formation under Pd catalysed conditions. Utilising the unsymmetrical 1-bis-(ditertiarybutyl- ...
156