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Isomerism in Complexes
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Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Not So Bioorthogonal Chemistry.

Dominik Schauenburg1,2, Tanja Weil1

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

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This summary is machine-generated.

Bioorthogonal chemistry enables selective molecular labeling in biological systems. However, challenges like reaction kinetics and selectivity need further research for broader applications in biology and medicine.

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Area of Science:

  • Bioorthogonal chemistry
  • Chemical biology
  • Molecular imaging

Background:

  • Bioorthogonal chemistry provides selective and noninvasive labeling of biomolecules in complex biological systems.
  • It has advanced the study of cellular processes, protein dynamics, and molecular interactions.
  • Current limitations include suboptimal reaction kinetics, biocompatibility issues, and a need for more orthogonal reactions.

Purpose of the Study:

  • To provide insights into reactions classified as bioorthogonal.
  • To highlight challenges and limitations in current bioorthogonal chemistry.
  • To discuss the potential and future directions of bioorthogonal chemistry.

Main Methods:

  • Review of literature on bioorthogonal reactions.
  • Analysis of selectivity and reactivity of common bioorthogonal chemistries.
  • Discussion of challenges in reaction kinetics, biocompatibility, and orthogonality.

Main Results:

  • Bioorthogonal chemistry is a powerful tool for studying biological systems.
  • Existing bioorthogonal reactions may lack desired selectivity with additives or catalysts.
  • Further development is needed to improve reaction kinetics, biocompatibility, and orthogonality.

Conclusions:

  • Bioorthogonal chemistry holds vast potential for advancing biology and medicine.
  • Addressing current challenges is crucial for realizing the full potential of bioorthogonal tools.
  • Continued research is necessary to develop more robust and selective bioorthogonal reactions.