Barbier Reaction1
Barbier may refer to: * Barbier (surname) *Barbier (crater), a feature on the Moon *Barbier reaction, a reaction in organic chemistry *Barbier's theorem In geometry, Barbier's theorem states that every curve of constant width has perimeter times its width, regardless of its precise shape. This theorem was first published by Joseph-Émile Barbier in 1860. Examples The most familiar examples of c ...

Barbier (surname)
Barbier is a French surname. Notable people with the surname include: * Antoine Alexandre Barbier (1765–1825), French librarian * Carl Barbier (born 1944), U.S. Federal Judge, Eastern District of Louisiana * Charles Barbier (1767–1841), French inventor of alternative writing methods * Charles Barbier de Meynard (1826–1908), French historian and orientalist * Christophe Barbier (born 1967), French journalist * Edmond Jean François Barbier (1689–1771), French jurisconsult * Darren Barbier (born 1960), American college football coach * Gabriel Barbier-Mueller, Swiss CEO of Harwood International * George Barbier (illustrator) (1882–1932), French illustrator * George Barbier (actor) (1864–1945), American actor * Henri Auguste Barbier (1805–1882), French dramatist and poet * Jean-François Barbier (1754–1828), French general during the French Revolutionary Wars and Napoleonic Wars * Joseph-Émile Barbier (1839–1889), French astronomer and mathematician * Leonid Ba ...
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Barbier (crater)
Barbier is a lunar impact crater that is located on the southern hemisphere on the far side of the Moon. It forms a matched pair with Cyrano to the north-northwest, and it lies to the southeast of the huge walled plain Gagarin. Southwest of Barbier is the crater Sierpinski, and to the southeast is the Mare Ingenii Mare Ingenii (Latin ''ingeniī'', the "Sea of Cleverness") is one of the few lunar mare features on the far side of the Moon. The mare sits in the Ingenii basin, which is of the Pre-Nectarian epoch, which lies in turn in the outer part of the old .... The outer rim of Barbier has been eroded somewhat by subsequent impacts, particularly at the north end where the wall has been degraded by several small craterlets. A small crater lies across the eastern rim, and the southern rim is wider and irregular in shape. An unusual irregular crater (Barbier F) with a hummocky floor, approximately 16 km long, lies near where a central peak would be located, offset to the eas ...
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Barbier Reaction
The Barbier reaction is an organometallic reaction between an alkyl halide (chloride, bromide, iodide), a carbonyl group and a metal. The reaction can be performed using magnesium, aluminium, zinc, indium, tin, samarium, barium or their salts. The reaction product is a primary, secondary or tertiary alcohol. The reaction is similar to the Grignard reaction but the crucial difference is that the organometallic species in the Barbier reaction is generated ''in situ'', whereas a Grignard reagent is prepared separately before addition of the carbonyl compound. Unlike many Grignard reagents, the organometallic species generated in a Barbier reaction are unstable and thus cannot be stored or sold commercially. Barbier reactions are nucleophilic addition reactions that involve relatively inexpensive, water insensitive metals (e.g zinc powder) or metal compounds. For this reason it is possible in many cases to run the reaction in water, making the procedure part of green chemistry. In cont ...
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