Ethyl(isopropyl)dimethylammonium hydroxide, $(\mathrm{CH}{}_3){}_2\mathrm{CH}-\mathrm{N}{}^{+}(\mathrm{CH}{}_3){}_2(\mathrm{CH}{}_2\mathrm{CH}{}_3)\mathrm{OH}{}^{-}$, is heated. The major products are:

In Hofmann elimination the beta-hydrogen most easily removed is on the least substituted carbon; ethyl beta-hydrogens (methyl, three H) are preferred over the six isopropyl methyl hydrogens. The ethyl group leaves as ethene and the tertiary amine isopropyl-dimethylamine ($(\mathrm{CH}{}_3){}_2\mathrm{CHN}(\mathrm{CH}{}_3){}_2$, N,N-dimethylpropan-2-amine) is the other product.