science · 14 March 1935 · 89 years ago
death
Died 14 Mar 1935 at age 78 (born 7 Mar 1857).
German chemist who won fame at the age of 25 for devising the synthesis of substituted pyridines. He studied stereochemistry of such nitrogen compounds. He synthesised pyridine (1882), cumaron (1886) and thiazol (1889) and he gave a nomenclature of heterocyclic compounds. His investigations of triphenylmethane coloring materials led to progress in the spectrographic analysis, and also the theory of chemical indicators. He was also noted for his study of acids, in which he showed their properties depended on reaction with a solvent; and the electrical conductivity of organic compounds. From 1907 he studied cryoscopy and UV-spectroscopy.
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