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Related Concept Videos

Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

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...
Chirality02:25

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Fischer Projections02:18

Fischer Projections

Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
Chirality in Nature02:30

Chirality in Nature

Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...

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Chirality transfer effects in proline-substituted coumarin compounds.

Eun-Kyung Park1, Bongjeong Park, Jun-Ho Choi

  • 1Department of Chemistry, Center for Multidimensional Spectroscopy, Korea University, Seoul 136-701, Korea.

The Journal of Physical Chemistry. B
|July 25, 2009
PubMed
Summary

Proline-substituted coumarin chromophores exhibit distinct conformations in solution. Circular dichroism and quantum chemistry reveal a dominant conformer in polar solvents, crucial for probing biomolecule structures.

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Area of Science:

  • Biophysical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Proline-substituted chromophores offer potential as chirality probes for biomolecules.
  • Understanding the conformational preferences of these probes is essential for their application in studying protein dynamics.

Purpose of the Study:

  • To determine the specific conformations of coumarin-proline conjugates.
  • To investigate the influence of solvent polarity on these conformations.
  • To establish the utility of these conjugates as chirality probes.

Main Methods:

  • Circular Dichroism (CD) spectroscopy was employed to measure the optical activity.
  • Quantum chemistry calculations were utilized to model and predict possible conformations.
  • Experimental CD spectra were compared with calculated spectra to identify dominant conformers.

Main Results:

  • Two distinct conformers of the coumarin-proline conjugate were identified, differing in the relative orientation of the coumarin ring.
  • In polar solvents (excluding water), one conformer was found to be dominant.
  • The study demonstrated significant chirality transfer from proline to the coumarin chromophore.

Conclusions:

  • The local structure around optical chromophores attached to biomolecules can be studied using electronic optical activity.
  • Coumarin-proline conjugates serve as effective chirality probes, with their dominant conformation being solvent-dependent.
  • This approach is valuable for investigating protein dynamics and local structural environments.