Jakob Meisenheimer

{{Short description|German chemist (1876–1934)}}

{{Infobox scientist

| name = Jakob Meisenheimer

| image = Jakob Meisenheimer.jpg

| image_size =

| caption = Jakob Meisenheimer

| birth_date = {{birth date|1876|6|14|df=y}}

| birth_place = Griesheim (Frankfurt am Main), German Empire

| nationality = German

| death_date = {{death date and age|1934|12|2|1876|6|14|df=y}}

| death_place = Tübingen, Germany

| field =

| work_institution = University of Munich,
University of Greifswald,
University of Tübingen

| alma_mater = University of Munich

| doctoral_advisor = Friedrich Karl Johannes Thiele

| doctoral_students =

| known_for = Meisenheimer complex,
Mechanism of the Beckmann rearrangement

| prizes =

| religion =

| footnotes =

}}

Jakob Meisenheimer (14 June 1876 – 2 December 1934) was a German chemist. He made numerous contributions to organic chemistry, the most famous being his proposed structure for a group of compounds now named Meisenheimer complex.{{cite journal

| title = Ueber Reactionen aromatischer Nitrokörper

| author = Jakob Meisenheimer

| journal = Justus Liebigs Annalen der Chemie

| volume = 323

| issue = 2

| year = 1902

| pages = 205–246

| doi = 10.1002/jlac.19023230205| url = https://zenodo.org/record/1427531

}} He also proposed the mechanism of the Beckmann rearrangement. Later in his career, he reported the synthesis of the pyridine-N-oxide.