Wilhelm Kubel

Carl Hermann Wilhelm Kubel (* 1832 ; † 1903 ) was a German pharmacist who worked in Holzminden .

Wilhelm Kubel was enrolled at the Collegium Carolinum in Braunschweig in 1850, initially as a listener and from 1854 as a student of pharmacy . In 1855 he continued his studies at the University of Göttingen , where he in 1860 with a thesis on anthranilic Dr. phil. received his doctorate. At the same time, he worked at the chemical laboratory in Braunschweig from 1857. From then on he worked here as the only chemical assistant and assistant teacher. In 1866 he examined the coniferin , discovered in 1861 with Theodor Hartig , isolated it from the sap of the conifers (conifers) and noticed a smell of vanilla when boiled with diluted acids.

In 1870 he gave up the assistant post and took over a pharmacy in Holzminden. With Georg Dragendorff , he researched cathartic acid from senna (as a laxative).

He left something of his conifer to his fellow student Wilhelm Haarmann , who was writing his doctoral thesis on it (1872) in Berlin. Haarmann, in turn, introduced him to Ferdinand Tiemann . Haarmann and Tiemann recognized that Kubel had used dilute mineral acids for the cleavage, which polymerize the initially formed cleavage product. Instead they used the fermentative emulsin , in the spring and summer of 1873 they presented themselves with great difficulty 2.5 kg of coniferin themselves and in 1874 they were able to report “About coniferin and its conversion into the aromatic principle of vanilla”.

The Kubel-Tiemann determination method and the litmus solution according to Kubel-Tiemann are known.

In 1875 “Mrs. Apoth. Kubel in Holzminden ”.

Publications

• Compounds of anthranilic acid with acids ; In: Justus Liebigs Annalen der Chemie 102/2, 1857, pp. 236-238
• About the anthranilic acid . Dissertation Göttingen 1860
• For the analysis of natural waters . 1867
• with Ferdinand Tiemann: Instructions for the investigation of water which is to be used for commercial and domestic purposes or as drinking water
• Testing of the Carlsbad salt . In: Archives of Pharmacy 229, 1891

literature

• Helmuth Albrecht: Technical education between science and practice. The Braunschweig University of Technology, 1862-1914 . Olms-Weidmann, Hildesheim 1987, ISBN 978-3-487-07819-9 , pp. 263, 265, 279.

Individual evidence

1. ↑ F. Tiemann, W. Haarmann: About coniferin and its transformation into the aromatic principle of vanilla . In: Reports of the German Chemical Society 7 , 608–623 (1874). doi : 10.1002 / cber.187400701193 . Digitized on Gallica .