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An Approach to Study Shape-Dependent Transcriptomics at a Single Cell Level

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Task-Dependent Coordination Levels of SmI₂.

Sandeepan Maity¹, Amey Nimkar¹, Shmaryahu Hoz¹

¹Department of Chemistry , Bar-Ilan University , Ramat Gan 5290002 , Israel.

The Journal of Organic Chemistry

|January 23, 2019

Summary

Ligands significantly impact samarium(II) iodide (SmI₂) chemistry by increasing reduction potential and enhancing protonation. The optimal ligand concentration differs for these effects, aiding in mechanistic studies.

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Area of Science:

Organic Chemistry
Inorganic Chemistry
Reaction Mechanisms

Background:

Samarium(II) iodide (SmI₂) is a versatile reducing agent in organic synthesis.
Ligand coordination influences the redox properties and reactivity of SmI₂.
Proton transfer reactions are crucial in many SmI₂-mediated transformations.

Purpose of the Study:

To investigate the distinct roles of ligands in modulating SmI₂ reduction potential and proton transfer.
To determine the optimal ligand stoichiometry for maximizing reduction potential versus protonation enhancement.
To establish the utility of differential ligand saturation as a diagnostic tool for reaction mechanisms.

Main Methods:

Electrochemical studies to quantify the effect of ligand concentration on SmI₂ reduction potential.
Kinetic analysis to assess ligand-dependent enhancement of radical anion protonation.
Comparative analysis of ligand saturation points for redox and protonation effects.

Main Results:

Ligand coordination significantly increases the reduction potential of SmI₂.
Proton-donating ligands enhance SmI₂ reactions via radical anion protonation.
The ligand concentration required for maximal reduction potential enhancement is substantially lower than that for maximal protonation rate enhancement.

Conclusions:

The differential ligand saturation observed provides a valuable diagnostic tool for distinguishing between single- and multi-step reaction pathways involving SmI₂.
This finding enables more efficient ligand utilization in SmI₂-mediated reactions.
Potential limitations in applying this diagnostic to proton-coupled electron transfer (PCET) and cyclization reactions are highlighted.