Accession Number:

ADA522181

Title:

Pairing Heterocyclic Cations with closo-Icosahedral Borane and Carborane Anions. II. Benchtop Alternative Synthetic Methodologies for Binary Triazolium and Tetrazolium Salts with Significant Water Solubility

Descriptive Note:

Journal article (preprint)

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE

Report Date:

2010-04-01

Pagination or Media Count:

25.0

Abstract:

Two efficient processes for the synthesis of twelve, relatively water soluble, heterocyclium closo-dodecaborane B12H12-2 and closo-dodecacarborane CB11H12-1 salts by a one-step, open-air metathesis reaction have been developed. First, a combination of exhaustive trituration of the two solid reactant salts with refluxing anhydrous acetonitrile followed by flash filtration through a plug of silica gel affords excellent recovery for a broad series of otherwise water-soluble salts. Second, an alternative aqueous metathesis, driven to completion by precipitation of silver halides, followed by removal of water, re-dissolution in acetonitrile, and filtration through a plug of silica gel, affords complex heterocyclium borane salts albeit with possible minor bleed-through of the by-product KNO3 salt. Mixed cation heterocyclium dodecaborane salts also can synthesized, and one example analyzed, shows melting point depression behavior.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE