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Paul Walden

Paul Walden was a Russian, Latvian and German chemist known for his work in stereochemistry and history of chemistry. In particular, he discovered Walden's rule, he invented the stereochemical reaction known as Walden inversion and synthesized the first room-temperature ionic liquid, ethylammonium nitrate.

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science · Russian chemist (1863–1957) · chemist · inventor · university teacher · historian of science · also Paul Walden, Walden

Born 14 July 1863 · Died 22 January 1957 · Q63131

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Jun 1954Award
Won Gmelin-Beilstein Commemorative Medal (1954).
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Jun 1942Award
Won August Wilhelm von Hofmann Medal (1942).
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1957· 1 entry

Jan 22, 1957Documented record86% confidence

Died 1957-01-22.

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1954· 1 entry

Jun 15, 1954Documented record84% confidence

Won Gmelin-Beilstein Commemorative Medal (1954).

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1949· 1 entry

1949Source gives the year onlyDocumented record66% confidence

Published his best-known book, History of Chemistry

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1942· 1 entry

Jun 15, 1942Documented record84% confidence

Won August Wilhelm von Hofmann Medal (1942).

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1934· 1 entry

Jun 15, 1934Documented record84% confidence

Awarded honorary doctor of the University of Madrid Complutense presented by Complutense University of Madrid (1934).

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1927· 1 entry

1927Source gives the year onlyDocumented record66% confidence

Was appointed as a foreign member of the Russian Academy of Sciences

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1924· 1 entry

1924Source gives the year onlyDocumented record66% confidence

Was invited back to Riga, where he gave a series of lectures

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1914· 1 entry

1914Source gives the year onlyDocumented record66% confidence

Synthesized the first room-temperature ionic liquid, namely ethylammonium nitrate (C2H5)NH+3·NO−3 with the melting point of 12 °C

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1911· 1 entry

1911Source gives the year onlyDocumented record66% confidence

Was invited to Saint Petersburg to lead the Chemical Laboratories of the academy founded in 1748, by Mikhail Lomonosov

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1905· 1 entry

1905Source gives the year onlyDocumented record66% confidence

Found a relationship between the maximum molecular conductivity and viscosity of the medium and in 1906, coined the term "solvation"

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1902· 1 entry

1902Source gives the year onlyDocumented record66% confidence

Proposed a theory of autodissociation of inorganic and organic solvents

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1895· 1 entry

1895Source gives the year onlyDocumented record70% confidence

Walden made his most remarkable discovery which was later named Walden inversion, namely that various stereoisomers can be obtained from the same compound via certain exchange reactions involving hydrogen

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1889· 1 entry

1889Source gives the year onlyDocumented record66% confidence

That the ionizing power of non-aqueous solvent is directly proportional to the dielectric constant

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1888· 1 entry

1888Source gives the year onlyDocumented record70% confidence

Walden graduated from the university with a degree in chemical engineering and continued working at the Chemistry Department as an assistant to professor C

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1887· 1 entry

1887Source gives the year onlyDocumented record66% confidence

And was devoted to the dependence of the electrical conductivity of aqueous solutions of salts on their molecular weight

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1886· 1 entry

1886Source gives the year onlyDocumented record66% confidence

Published his first scientific study on the color evaluation of the reactions of nitric and nitrous acid with various reagents and establishing the limits of sensitivity of the color method to detection of nitric aci

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1863· 1 entry

Jul 14, 1863Documented record86% confidence

Born 1863-07-14.

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