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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...
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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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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.
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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.
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A Micropatterning Assay for Measuring Cell Chirality
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Rooting prebiotic chirality in spinomeric chemistry?

Radu Popa1, Vily Marius Cimpoiaşu, Romulus Ion Scorei

  • 1Portland State University, Portland, Oregon 97201, USA. rpopa@pdx.edu

Astrobiology
|October 23, 2009
PubMed
Summary
This summary is machine-generated.

Spinomeric chemistry reveals how spin-isomers influence chemical reactions. This study shows H(2)(17)O affects chiral reactivity and hydration, with implications for prebiotic chemistry in magnetic fields.

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Published on: February 7, 2019

Area of Science:

  • Physical Chemistry
  • Spinomeric Chemistry
  • Astrochemistry

Background:

  • Spin-isomery influences chemical reactivity, especially in magnetic fields.
  • Complex spinomers form in molecules with adjacent nuclear spins.
  • H(2)(17)O has been linked to enantioselective proton exchange in sugars.

Purpose of the Study:

  • To investigate the role of H(2)(17)O in chiral reactivity.
  • To explore spinomer-based interactions in asymmetric hydration.
  • To develop an experimental model for studying spinomeric effects.

Main Methods:

  • Time Domain (1)H Nuclear Magnetic Resonance (TD-(1)HNMR) at 0.589 T.
  • Titration of asparagine and mandelic acid with H(2)(17)O at constant pH.
  • Analysis of proton exchange enantio-differences, DeltapK, 1/T(2)(0), and DeltaM(2).

Main Results:

  • Enantioselective differences in DeltapK and 1/T(2)(0) were observed with H(2)(17)O.
  • Mandelic acid, lacking a -NH(2) spinomer group, showed hydration differences.
  • Linear changes in DeltaM(2) indicated varying enantiomer affinity for H(2)(17)O hydration.

Conclusions:

  • H(2)(17)O-based spinomeric chemistry is crucial for chiral reactivity.
  • Findings suggest a novel interpretation for prebiotic chiral reactivity under magnetic fields.
  • Potential for abiotic isotopic fractionation of H(2)(17)O with chiral molecules was highlighted.