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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Crystalline potassium boryl dithiolate and diselenolate.

Yuyang Dai1, Yu Wang1, Liliang Wang2

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|December 3, 2024
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Summary

Potassium graphite (KC8) cleaves bonds in trithiadiborolane and triselena-diborolane. This research yields the first isolable boryl dithiolate and a unique boryl diselenolate, advancing inorganic chemistry.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • 1,2,4,3,5-trithiadiborolane and 1,2,4-triselena-3,5-diborolane are heterocyclic compounds containing boron, sulfur, and selenium.
  • Cleavage of B-S and S-S bonds in such systems is challenging and less explored.
  • Isolable boryl thiolates and selenolates are valuable synthetic intermediates.

Purpose of the Study:

  • To investigate the reactivity of 1,2,4,3,5-trithiadiborolane and 1,2,4-triselena-3,5-diborolane with potassium graphite (KC8).
  • To synthesize and characterize novel boryl dithiolate and boryl diselenolate compounds.
  • To explore the structural diversity and stability of these organoboron sulfur and selenium compounds.

Main Methods:

  • Chemical reduction using potassium graphite (KC8) as a reducing agent.
  • Isolation and purification of reaction products.
  • Structural characterization using techniques such as X-ray crystallography and spectroscopy.

Main Results:

  • Cleavage of both B-S and S-S bonds in 1,2,4,3,5-trithiadiborolane by KC8 yielded the isolable boryl dithiolate DmpB(SK)2 (3).
  • Reduction of 1,2,4-triselena-3,5-diborolane with KC8 afforded the boryl diselenolate DmpB(SeK)(SeSeK) (4).
  • The structure of the ligand-substituted diselenolate was authenticated, revealing unprecedented structural features.

Conclusions:

  • Potassium graphite is an effective reagent for the reductive cleavage of B-S and S-S bonds in trithiadiborolane and related heterocycles.
  • The study reports the first isolable boryl dithiolate and a novel boryl diselenolate with unique structural characteristics.
  • These findings expand the scope of organoboron sulfur and selenium chemistry and provide access to new synthetic building blocks.