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WISLICENUS, JOHANNES (1835-1902)

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Originally appearing in Volume V28, Page 754 of the 1911 Encyclopedia Britannica.
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WISLICENUS, JOHANNES (1835-1902) , See also:German chemist, was See also:born on the 24th of See also:June 1835 at See also:Klein-Eichstedt, in Thuringia. In 1853 he entered See also:Halle University, but in a few months emigrated to See also:America with his See also:father. For a See also:time he acted as assistant to See also:Professor E. N. Horsford at Harvard, and in 1855 was appointed lecturer at the See also:Mechanics' See also:Institute in New See also:York. Returning to See also:Europe in 1856, he continued his studies at See also:Zurich University, where nine years later he became professor of See also:chemistry. This See also:post he held till 1872. He then succeeded A. F. L. Strecker in the See also:chair of chemistry at See also:Wurzburg, and in 1885, on the See also:death of A. W.

H. See also:

Kolbe, was appointed to the same professorship at See also:Leipzig, where he died on the 6th of See also:December 1902. As an See also:original investigator he devoted himself almost exclusively to organic chemistry, and especially to stereo-chemistry. His See also:work on the lactic acids cleared up many difficulties concerning the See also:combination of See also:acid and alcoholic properties in oxy-acids in See also:general, and resulted in the See also:discovery of two substances differing in See also:physical properties though possessing a structure of proved chemical identity. To this phenomenon, then noticed for the first time, he gave the name of " geometrical See also:isomerism." So far back as 1869, before the publication of the See also:doctrine of J. H. See also:van't Hoff and J. A. Le See also:Bel, he expressed the See also:opinion that the See also:ordinary constitutional formulae did not afford an adequate explanation of certain See also:carbon compounds, and suggested that See also:account must be taken of the verschiedeneLagerung ihrer Atome See also:im Raume. Later (see See also:Die rdumliche Anordnung der Atome in organischen Molekiilen, 1887) he extended the application of the van't Hoff-Le Bel theory, believing that it, together with the supposition that there are " specially directed forces, the See also:affinity-energies," which determine the relative position of atoms in the See also:molecule, afforded a method by which the spatial arrangement of atoms in particular cases may be ascertained by experiment. Wislicenus is also known for his work on aceto-acetic ester and its application as a synthetical See also:agent. He was awarded the See also:Davy See also:medal by the Royal Society in 1898.

End of Article: WISLICENUS, JOHANNES (1835-1902)

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