ALEXANDRE-LÉON ÉTARD The Étard reaction and other contributions to chemistry
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| Natura: | Artículo científico |
| Lingua: | en |
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Centro Nacional de Investigaciones Científicas
2019
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| author | Jaime Wisniak |
| author_facet | Jaime Wisniak |
| contents | ALEXANDRE-LÉON ÉTARD The Étard reaction and other contributions to chemistry Jaime Wisniak Química cupric solubility strychnine cuprous salts Chlorochromic acid Alexandre-Léon Étard (1852-1919) was a French chemist who studied the chemistry of chrome and its derivatives, in particular the reactions that transformed the salts of chromic oxide from one derivative into another, and the action of chlorochromic acid on organic compounds. He found that the oxidation of organic compounds followed different paths according to the nature of the substance attacked and the substitution groups present. The reaction allowed the formation of ketones or quinones, with the simultaneous release of chlorine or hydrogen chloride (the Étard reaction). This reaction transformed the methyl group attached to an aromatic nucleus into the pertinent aldehyde and allowed the synthesis of aldehydes directly from hydrocarbons. The attack of an aromatic ring yielded quinones. Étard discovered that sulfates were able to intermix to generate complex acids or neutral salts presenting coloration properties quite different from those of the simple salts from which they were derived. Together with Bémont they studied the ferricyanides and synthesized many of new complex salts; He determined the solubility of a large number of inorganic and organic salts and their mixtures as a function of the temperature, carried on the synthesis of many new organic compounds, and together with Gal determined the composition of strychnine by reacting it with a variety of chemicals. 2019 artículo científico 1015-8553 https://www.redalyc.org/articulo.oa?id=181662291004 https://www.redalyc.org/journal/1816/181662291004/ https://www.redalyc.org/journal/1816/181662291004/html/ https://www.redalyc.org/journal/1816/181662291004/181662291004.epub https://www.redalyc.org/journal/1816/181662291004/movil en http://www.redalyc.org/revista.oa?id=1816 Revista CENIC. Ciencias Químicas application/pdf Centro Nacional de Investigaciones Científicas Revista CENIC. Ciencias Químicas (Cuba) Num.1 Vol.50 |
| format | Artículo científico |
| id | redalyc_181662291004 |
| institution | Redalyc |
| language | en |
| publishDate | 2019 |
| publisher | Centro Nacional de Investigaciones Científicas |
| spellingShingle | ALEXANDRE-LÉON ÉTARD The Étard reaction and other contributions to chemistry Jaime Wisniak Química cupric solubility strychnine cuprous salts Chlorochromic acid ALEXANDRE-LÉON ÉTARD The Étard reaction and other contributions to chemistry Jaime Wisniak Química cupric solubility strychnine cuprous salts Chlorochromic acid Alexandre-Léon Étard (1852-1919) was a French chemist who studied the chemistry of chrome and its derivatives, in particular the reactions that transformed the salts of chromic oxide from one derivative into another, and the action of chlorochromic acid on organic compounds. He found that the oxidation of organic compounds followed different paths according to the nature of the substance attacked and the substitution groups present. The reaction allowed the formation of ketones or quinones, with the simultaneous release of chlorine or hydrogen chloride (the Étard reaction). This reaction transformed the methyl group attached to an aromatic nucleus into the pertinent aldehyde and allowed the synthesis of aldehydes directly from hydrocarbons. The attack of an aromatic ring yielded quinones. Étard discovered that sulfates were able to intermix to generate complex acids or neutral salts presenting coloration properties quite different from those of the simple salts from which they were derived. Together with Bémont they studied the ferricyanides and synthesized many of new complex salts; He determined the solubility of a large number of inorganic and organic salts and their mixtures as a function of the temperature, carried on the synthesis of many new organic compounds, and together with Gal determined the composition of strychnine by reacting it with a variety of chemicals. 2019 artículo científico 1015-8553 https://www.redalyc.org/articulo.oa?id=181662291004 https://www.redalyc.org/journal/1816/181662291004/ https://www.redalyc.org/journal/1816/181662291004/html/ https://www.redalyc.org/journal/1816/181662291004/181662291004.epub https://www.redalyc.org/journal/1816/181662291004/movil en http://www.redalyc.org/revista.oa?id=1816 Revista CENIC. Ciencias Químicas application/pdf Centro Nacional de Investigaciones Científicas Revista CENIC. Ciencias Químicas (Cuba) Num.1 Vol.50 |
| title | ALEXANDRE-LÉON ÉTARD The Étard reaction and other contributions to chemistry |
| topic | Química cupric solubility strychnine cuprous salts Chlorochromic acid |
| url | https://www.redalyc.org/articulo.oa?id=181662291004 https://www.redalyc.org/journal/1816/181662291004/ https://www.redalyc.org/journal/1816/181662291004/html/ https://www.redalyc.org/journal/1816/181662291004/181662291004.epub https://www.redalyc.org/journal/1816/181662291004/movil |