КЕТЕНЕ

Химические свойства

Colorless gas; disagreeable odor. Readily polymerizes; cannot be shipped or stored in a gaseous state.

Использование

Acetylating agent, generally reacting with compounds having an active hydrogen atom; reacts with ammonia to give acetamide. Starting point for making various commercially important products, especially acetic anhydride and acetate esters.

Определение

A member of a group of organic compounds, general formula R₂C:CO, where R is hydrogen or an organic radical. The simplest member is the colorless gas ketene, CH₂:CO; the other ketenes are colored because of the presence of the double bonds. Ketenes are unstable and react with other unsaturated compounds to give cyclic compounds.

Опасность

Toxic by inhalation, strong irritant to skin and mucous membranes.