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Updated: Sep 9, 2025

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

Published on: September 28, 2022

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揺りかごの三人組:サイクルジスルファイドの超高速ダイナミクス

James Merrick1, Lewis Hutton1, Joseph C Cooper1

  • 1Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK. adam.kirrander@chem.ox.ac.uk.

Physical chemistry chemical physics : PCCP
|August 29, 2025
PubMed
まとめ

スピン・オービタ・カップリングは 1,2-ディチアン光力学に大きな影響を与える. トリプレット状態はシングレット集団を枯渇させ,システム間の交差を通して,化学反応に影響を与えるような,ラジカル再結合を妨げます.

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Preparation and Reactions of Sulfides02:26

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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