| Birth date | 1 April 1850 |
|---|---|
| Birth place | Nürnberg, Kingdom of Bavaria, German Empire |
| Death date | 19 April 1902 (aged 52) |
| Death place | Tübingen, Kingdom of Württemberg, German Empire |
| Field | organic chemistry |
| Work institution | Ludwig-Maximilians-Universität München University of Tübingen |
| Alma mater | University of Greifswald |
| Doctoral advisor | Heinrich Limpricht |
| Doctoral students | William Hobson Mills Julius B. Cohen |
| Known for | Pechmann condensation Diazomethane |
Freiherr[a] Hans von Pechmann (1 April 1850 – 19 April 1902) was a German chemist, renowned for his discovery of diazomethane in 1894.[1][2] Pechmann condensation[3][4] and Pechmann pyrazole synthesis.[5] 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 Nuremberg, 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.[6] After studying with Heinrich Limpricht at the University of Greifswald he became professor at the Ludwig-Maximilians-Universität München until 1895. He was professor at the University of Tübingen from 1895 until his death. He killed himself by taking cyanide, aged 52.[6]
Works
- Volhard's Anleitung zur Qualitativen chemischen Analyse . Chemisches Labolatorium des Staates, Munich 9th & 10th ed. 1901 Digital edition by the University and State Library Düsseldorf
- Anleitung zur quantitativen Analyse nach Cl. Zimmermann: zum Gebrauche im chemischen Laboratorium des Staates zu München. Chemisches Laboratorium des Staates, Munich 10th ed. 1901 Digital edition by the University and State Library Düsseldorf
See also
Notes
References
- ^ H. von Pechmann (1894). "Ueber Diazomethan". Berichte der deutschen chemischen Gesellschaft. 27 (2): 1888–1891. doi:10.1002/cber.189402702141
- ^ H. von Pechmann (1895). "Ueber Diazomethan". Berichte der deutschen chemischen Gesellschaft. 28 (1): 855–861. doi:10.1002/cber.189502801189
- ^ H. von Pechmann, Carl Duisberg (1883). "Ueber die Verbindungen der Phenole mit Acetessigäther". Berichte der deutschen chemischen Gesellschaft. 16 (1): 2119–2128. doi:10.1002/cber.188301602117
- ^ H. von Pechmann (1884). "Neue Bildungsweise der Cumarine. Synthese des Daphnetins". Berichte der deutschen chemischen Gesellschaft. 17 (1): 929–936. doi:10.1002/cber.188401701248
- ^ H. von Pechmann (1898). "Pyrazol aus Acetylen und Diazomethan". Berichte der deutschen chemischen Gesellschaft. 31 (3): 2950–2951. doi:10.1002/cber.18980310363
- ^ Koenigs, Wilhelm (1903). "Hans von Pechmann". Berichte der Deutschen Chemischen Gesellschaft. 36 (4): 4417–4511. doi:10.1002/cber.190303604134
- Partington, J. R. A History of Chemistry. Macmillan: 1964; vol. 4, p. 838-839.