Alexandre Léon Étard was a French
chemist
A chemist (from Greek ''chÄ“m(Ãa)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe ...
. He was born on 5 January 1852 in
Alençon
Alençon (, , ; nrf, Alençoun) is a commune in Normandy, France, capital of the Orne department. It is situated west of Paris. Alençon belongs to the intercommunality of Alençon (with 52,000 people).
History
The name of Alençon is fi ...
,
and died on 1 May 1910 in
Paris
Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. ...
.
Étard was a preparer at the
Wurtz Laboratory at
École Pratique des Hautes Études
École may refer to:
* an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée)
* École (river), a tributary of the Seine flowing in région Île-de-France
* École, Sa ...
, and became a member of the
Société de Chimie Industrielle in 1875. He studied at the
Sorbonne
Sorbonne may refer to:
* Sorbonne (building), historic building in Paris, which housed the University of Paris and is now shared among multiple universities.
*the University of Paris (c. 1150 – 1970)
*one of its components or linked institution, ...
, and earned a
Doctorate in Physical Sciences in 1880.
Étard discovered the
oxidation
Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a ...
reaction
Reaction may refer to a process or to a response to an action, event, or exposure:
Physics and chemistry
*Chemical reaction
*Nuclear reaction
*Reaction (physics), as defined by Newton's third law
* Chain reaction (disambiguation).
Biology and me ...
of
methyl groups
In organic chemistry, a methyl group is an alkyl derived from methane, containing one carbon atom bonded to three hydrogen atoms, having chemical formula . In formulas, the group is often abbreviated as Me. This hydrocarbon group occurs in many ...
linked to
aromatic
In chemistry, aromaticity is a chemical property of cyclic (ring-shaped), ''typically'' planar (flat) molecular structures with pi bonds in resonance (those containing delocalized electrons) that gives increased stability compared to sat ...
rings or to
heterocycles using
chromyl chloride
Chromyl chloride is the inorganic compound with the formula CrO2Cl2. It is a reddish brown compound that is a volatile liquid at room temperature, which is unusual for transition metal complexes.
Preparation
Chromyl chloride can be prepared by th ...
, known as the
Étard reaction. Chromyl chloride is sometimes also called "Étard reagent".
Publications
* ''Les Nouvelles Théories chimiques'', Paris, G. Masson, 1895 .
* ''La biochimie et les chlorophylles'', Masson et Cie (Paris), 1906
Online text available on IRIS
References
{{DEFAULTSORT:Etard, Alexandre Léon
19th-century French chemists
1852 births
1910 deaths
20th-century French chemists
People from Alençon