This process is accompanied by the fragmentation of the cage carborane structure and the formation and rearrangement of free radicals. From the TGA/MS data of PBSZ0:1 (Figure 2b), it can be seen that H2 and NH3 and ·B3H3 and ·NH2/CH4 are generated. The signals of these substances ...
In the other reaction mode, intermolecular cyclization reactions gave A4- and trans-A2B2-meso-substituted porphyrins under mild reaction conditions with low scrambling. Keywords: C–C bond formation; Chemical Synthesis; dipyrromethane; heterocyclic chemistry; IUPAC Congress-44; metal triflates; ...
4d. As expected from the d band theory, an upward shift of the d states of active Co sites with respect to the Fermi level results in a stronger Co–O bond, strengthening the oxygen-containing intermediates adsorption. However, the over upward shift of d states of active Co sites with ...
Hydrogen- bond between N-terminal Met of docked peptide and Y140 of RimIMtb is represented by dotted line (b) Residues involved in hydrophobic contact between RimIMtb and N-terminal Met of docked substrate peptide, defining substrate binding pocket of the enzyme (c) Surface cartoon of binding ...
The difficulty in oxygen reduction was due to the particularly high energy of the O = O bond (498 kJ/mol) and slow activation of the kinetic (Li et al., 2016; Liu et al., 2022b). Show abstract Chromium decorated leaf-like N-doped carbon anchoring with active Cr-N<inf>x</inf> ...
The standard enthalpy of a reaction can be calculated from tabulated standard molar enthalpies of formation using the relation: ( H o = ((H of (products) - ((H of (reactants) 97 39 153 (ii) Bond Enthalpies LEARNI 下载文档 收藏 分享 赏 0...
When a heteroatom with a different size or electronegativity from carbon replaces some of the carbon atoms in the graphene lattice, structural distortion or bias in the charge density distribution occurs in the graphene network, leading to the formation of active sites on the heteroatom-doped ...
A Z1,Z2-migration leads to two diastereomeric adducts with a p-coordinated imine that then inserts into the Ir–H bond to give the corresponding Ir amide complexes. The previous step is a simultaneous hydrogenolysis of the Ir–N and the formation of an Ir–H bond, presumably via hetero...
2.2. α-C(sp3)–N Formation C–N bonds widely occur in drug candidates and natural bioactive compounds [96,97]. Pleasingly, the visible-light-driven α-C(sp3)–H bond functionalization of glycine derivatives with transition metal complexes can also be used to construct C–N bonds. In 2021...
These adaptions are accompanied by adjustments of gene regulation, resulting in the formation of different metabolic pathways to give birth to a large number of new secondary metabolites [4,5]. Polyketides are a class of structurally diverse natural products with carbon skeletons originating from the...