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
Personal Author(s):
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.
Descriptors:
Subject Categories:
- Organic Chemistry
- Physical Chemistry