2-Bromo-2-methylbutane is treated with $(\mathrm{CH}{}_3){}_3\mathrm{COK}$ in $(\mathrm{CH}{}_3){}_3\mathrm{COH}$. The major alkene is:

The bulky tert-butoxide base removes the sterically more accessible hydrogen of a methyl group rather than the hindered internal methylene hydrogen. This gives the less substituted Hofmann product, 2-methylbut-1-ene.