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The Methanol-Trimethoxyborane Azeotrope as a Solvent

M. M. Kreevoy ; Chemical Dynamics Laboratory, Department of Chemistry, University of Minnesota, Minneapolis, Minn. 55455, U.S.A .
S . S. Kantner ; Chemical Dynamics Laboratory, Department of Chemistry, University of Minnesota, Minneapolis, Minn. 55455, U.S.A .


Puni tekst: engleski pdf 3.564 Kb

str. 31-39

preuzimanja: 101

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Sažetak

The methanol-trimethoxyborane azeotrope is an ea.sily prepa.
red solvent of strong H-bond donor and weak H-bond acceptor
properties. It has a low viscosity and low boiling point, and is
completely transparent in the visible and uv at wave lengths above
220 nm. It has a dieLectric constant of 9 and ion pair formation
constants between 103 and 104 for simple electrolytes. The glass
electrode pH-meter can be used in this solvent, with the ordinary
calomel reference electrode. Indicator acidity measurements are
somewhat complicated by the forma•tion of H-bonded ion pairs.
The solvent is useful for measuning the relative acidity of
strong acids; CH3S020H and CF3S020H are readily differentiated.
It should be useful for other physico-chemical measurements and
also in preparative chemistry.

Ključne riječi

Hrčak ID:

196409

URI

https://hrcak.srce.hr/196409

Posjeta: 247 *