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Hans von Pechmann
Hans v Pechmann ca1899.jpg
Born 1 April 1850
Nürnberg, Kingdom of Bavaria, German Empire
Died 19 April 1902(1902-04-19) (aged 52)
Nationality German
Alma mater University of Greifswald
Known for Pechmann condensation Diazomethane
Scientific career
Fields organic chemistry
Institutions University of Munich University of Tübingen
Doctoral advisor Heinrich Limpricht
Doctoral students William Hobson Mills Julius B. Cohen

Hans Freiherr von Pechmann (1 April 1850 – 19 April 1902) was a German chemist, renowned for his discovery of diazomethane in 1894. Pechmann condensation and Pechmann pyrazole synthesis. He also first prepared 1,2-diketones (e.g., diacetyl), acetonedicarboxylic acid, methylglyoxal and diphenyltriketone; established the symmetrical structure of anthraquinone.

Von Pechmann also produced the first example of solid polyethylene serendipitously in 1898, via the decomposition of diazomethane.

Life

Von Pechmann was born in Nürnberg, the only son of a doctor, who was also named Hans. The von Pechmanns had distinguished themselves as soldiers; in 1702, von Pechmann's ancestor Martin Günther von Pechmann, a general of artillery in the Bavarian army, had been raised to the rank of a baron of the Holy Roman Empire by Leopold I. After studying with Heinrich Limpricht at the University of Greifswald he became professor at the University of Munich till 1895. He was professor at the University of Tübingen from 1895 until his death. He died by taking cyanide, aged 52.

See also

  • German inventors and discoverers
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