The C-F bond-forming step in the fluorinase, the only native fluorination enzyme characterized to date, has been studied. The enzyme catalyzes the reaction between S-adenosyl-L-methionine (SAM) and fluoride ions to form 5'-fluoro-5'-deoxyadenosine (5'-FDA) and L-methionine. To obtain an...
Structurally, calcimycin is composed of an α-ketopyrrole, a spiroketal ring (i.e., a polyketide) which is synthesized by the above-mentioned type I modular PKSs, and a substituted benzoxazole moiety which involves an unusual C–N bond formation and product release12 (Supplementary Fig. 1)....
A localized one-electron orbital base, called bond-distorted orbital, is introduced to study hypothetically localized structures in the framework of valence bond theory. The use of valence bond method with bond-distorted orbitals allows us to evaluate the effects of hybridization and resonance on carb...
E. Understanding and exploiting C–H bond activation. Nature 417, 507–514 (2002). Article CAS PubMed Google Scholar Hartwig, J. F. Evolution of C–H bond functionalization from methane to methodology. J. Am. Chem. Soc. 138, 2–24 (2016). Article CAS PubMed Google Scholar Gensch,...
Eighty pull-out specimens were used to study the effect of temperature ranging from 20 °C to 80 °C in dry environment on bond properties between Glass Fiber Reinforced Polymer (GFRP) bars and concrete. The pullout-test specimens were subjected during 4 and 8 months to high temperatures up...
Up to now the optimal bond strength of the Cf/C-TC4 brazed joints reported was 42 MPa [4], below than the strength of the Cf/C substates (54.3 ± 5 MPa). The present work tried to introduce a pure Ni foil as the interlayer to braze the Cf/C and TC4. The synergistic effects of...
Let's try to build a function taking a pointer to a function taking nothing and returning int, and returning a pointer to a function taking a char and returning int. With type-defs it's like this typedef int ReturnFunction(char); typedef int ParameterFunction(void); ReturnFunction *f(...
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This reaction has two interesting features: (1) the synthesis of difluoromethylene compounds through Lewis acid-catalyzed activation of a single C–F bond... N Hisano,D Kimura,K Mori - 《Chemistry Letters》 被引量: 0发表: 2019年 Stabilization of the P(CF[sub 3])[sub 2][sup -] ...