1 -Bromo-2-methylpropane

The method of selective absorption was also applied successfully to the isolation of isomeric compounds. The use of a selective absorber after the unsuccessful attempts at separation by conventional chromatographic methods made it possible to analyse the isomeric compounds 2-bromobutane and 1-bromo-2-methylpropane [91]. 

A glas tube (diameter 0.8 cm), filled successively with the following reagents, was used as a reactor 3 cm of silver nitrate on diatomite (1 1), 2cm of sulphuric acid on diatomite, and 1 cm of disodium phosphate on diatomite. Each layer in the reactor was separated from the next with a small layer of diatomite brick. The reactor was placed before the separating column (LSP Twin-60). At room temperature 2-bromobutane is absorbed quantitatively by the layer of silver nitrate, and 1 -bromo-2-methylpropane does not react with it. The use of a reactor containing silver nitrate for absorbing dichloro-ethane and dibromoethylene in the GC analysis of methyl and ethyl compounds of lead in petrols using an electron-capture detector has been described [92]. 

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