Butan-2-yl trimethylammonium hydroxide, $\mathrm{CH}{}_3\mathrm{CH}{}_2\mathrm{CH}(\mathrm{CH}{}_3)-\mathrm{N}{}^{+}(\mathrm{CH}{}_3){}_3\mathrm{OH}{}^{-}$, is heated. The major alkene is:

Hofmann elimination of quaternary ammonium hydroxides removes the most accessible, most acidic beta-hydrogen (from the methyl group), giving the less substituted alkene but-1-ene with trimethylamine. This is opposite to Saytzeff orientation.