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Related Concept Videos

Orthogonal Trajectories01:26

Orthogonal Trajectories

260
Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
260
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

8.0K
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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Stereoisomerism02:52

Stereoisomerism

14.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
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...
14.7K
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

4.1K
Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

9.8K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
9.8K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

805
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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Bioorthogonal Chemical Imaging of Cell Metabolism Regulated by Aromatic Amino Acids
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Orthogonal bioorthogonal chemistries.

David M Patterson1, Jennifer A Prescher2

  • 1Department of Chemistry, University of California, Irvine, CA 92697, USA.

Current Opinion in Chemical Biology
|August 16, 2015
PubMed
Summary
This summary is machine-generated.

Orthogonal bioorthogonal reactions enable simultaneous study of multiple biomolecules in living systems. This advancement facilitates complex biological network analysis and macromolecule assembly.

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Area of Science:

  • Chemical Biology
  • Molecular Imaging
  • Biochemistry

Background:

  • Bioorthogonal reactions are crucial for studying individual biomolecules in vivo.
  • Analyzing complex biological networks requires multiple, simultaneously active bioorthogonal reactions.
  • Recent advancements have introduced orthogonal bioorthogonal chemistries.

Purpose of the Study:

  • To highlight the development of orthogonal bioorthogonal reactions.
  • To showcase their applications in multi-target imaging and macromolecule assembly.
  • To discuss methods for controlling orthogonal reactivity and identify new compatible reactions.

Main Methods:

  • Review of literature on orthogonal bioorthogonal reaction development.
  • Analysis of applications in biological imaging and assembly.
  • Discussion of reactivity control strategies.

Main Results:

  • Orthogonal bioorthogonal reactions enable simultaneous, independent chemical transformations in biological systems.
  • These reactions are successfully applied in advanced multi-target imaging and the construction of complex macromolecules.
  • Methods for tuning and controlling reactivity are essential for their effective use.

Conclusions:

  • Orthogonal bioorthogonal chemistry is a powerful tool for dissecting complex biological systems.
  • Continued development promises new reaction classes and expanded applications in chemical biology.
  • This field is key to advancing our understanding of intricate biological networks.