Factors in the formation of isomerically and optically pure alkyl halides. Part V. Conditions which determine the formation of 2-halogeno-2-methyl- and 2-halogeno-3-methyl-butanes in the preparation of 1-halogeno-2,2-dimethylpropanes from 2,2-dimethylpropan-1-ol

Abstract

Gas–liquid chromatography shows that the preparation of 1-halogeno-2,2-dimethylpropanes from the corresponding alcohol may be accompanied by the formation of 2-halogeno-2-methylbutanes and 2-halogeno-3-methylbutanes. The latter are frequently observed in bromide or iodide systems and are thought to result from isomerization of the first formed t-halides. Rearrangements occurring during the reactions of 2,2-dimethylpropan-1-ol with the hydrogen, phosphorus, and thionyl halides are reported and an assessment is made of various preparative procedures.