After Karl Reimer took his Abitur and was schooled at the Friedrichs-Gymnasium Berlin in 1865, he started his studies in Göttingen and Greifswald but was interrupted by the draft of the German War of 1866.
Karl then received short-term employment with Botanist Theodor Hartig at the Königl, Eberswalde Forestry Academy and Hofmann at the university.
The latter also referred Reimer to the new Berlin chemical factory founded by Carl August Ferdinand Kahlbaum in 1870, before earning his doctorate, in Schlesische Straße.
[3] In the spring of 1875, due to the sudden death of Theodor Goldschmidt, he took over the management of his factory for Tin preparations at short notice and on a temporary basis.
[7] In 1876, Tiemann offered Reimer an equal share in his up-and-coming product, Haarmann's Vanillinfabrik, developed in 1874, in Holzminden as co-owner - he accepted.