Methylpentynol is prepared by reaction of butanone (MEK) with sodium acetylide. This page provides supplementary chemical data on butanone. It has also been used as a precursor to polypropylene resins, butylene oxide, and butanone. It is used as a reagent with butanone to yield the dimethylglyoxime end product. Side-products may also form, including butanone, ethyl acetate, formic acid, and propionic acid. Butanone is a constituent of tobacco smoke. The compound can be prepared from butanone by reaction with ethyl nitrite. Butanone oxime is also used in some types of RTV silicones. Butanone may be produced by oxidation of 2-butanol. Butanone fires should be extinguished with carbon dioxide, dry agents, or alcohol-resistant foam. Butanone can react with most oxidizing materials, and can produce fires. Butanone is also used in dry erase markers as the solvent of the erasable dye.