Otto Dimroth

{{Infobox scientist

| name = Otto Dimroth

| image = Otto dimroth 1935 würzburg-2.jpg

| image_size = 173px

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| birth_date = 28 March 1872

| birth_place = Bayreuth, German Empire

| death_date = {{death date and age|1940|5|16|1872|3|28|df=y}}

| death_place = Aschaffenburg, Germany

| nationality = German

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| work_institutions = University of Greifswald,
University of Munich,
University of Würzburg

| alma_mater =

| doctoral_advisor = Johannes Thiele

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Otto Dimroth (28 March 1872 – 16 May 1940) was a German chemist. He is known for the Dimroth rearrangement,{{cite journal | author = D. Otto | title = Ueber intramolekulare Umlagerungen. Umlagerungen in der Reihe des 1, 2, 3-Triazols | year = 1909 | journal = Justus Liebig's Annalen der Chemie | volume = 364 | issue = 2 | pages = 183–226 | doi = 10.1002/jlac.19093640204| url = https://zenodo.org/record/1427579 }}{{cite journal | author = W. M. Otto Dimroth | title = Intramolekulare Umlagerung der 5-Amino-1,2,3-triazole | year = 1927 | journal = Justus Liebig's Annalen der Chemie | volume = 459 | issue = 1 | pages = 39–46 | doi = 10.1002/jlac.19274590104}} as well as a type of condenser with an internal double spiral, the Dimroth condenser. He made pioneering contributions to organomercury chemistry.{{cite journal | title = Ueber die Einwirkung von Quecksilberoxydsalzen auf aromatische Verbindungen | journal = Berichte der deutschen chemischen Gesellschaft | volume = 32 | issue = 1 | year = 1899 | pages = 758–765 | author = Otto Dimroth | doi = 10.1002/cber.189903201116| url = https://zenodo.org/record/1425926}}{{cite journal | title = Ueber die Mercurirung aromatischer Verbindungen | journal = Berichte der deutschen chemischen Gesellschaft | volume = 35 | issue = 2 | year = 1902 | pages = 2032–2045 | author = Otto Dimroth | doi = 10.1002/cber.190203502154| url = https://zenodo.org/record/1426050}}

His son Karl Dimroth was also a renowned chemist, who described the first synthesis of 3-benzoxepin.{{cite journal|first1 = K.|last1 = Dimroth|first2 = G.|last2 = Pohl|title = 3-Benzoxepin|journal = Angew. Chem.|volume = 73|issue = 12|page = 436|year = 1961|doi = 10.1002/ange.19610731215}}{{cite journal|first1 = K.|last1 = Dimroth|first2 = G.|last2 = Pohl|first3 = H.|last3 = Follmann|title = Die Synthese von Derivaten des 3-Oxepins und des Furans durch eine zweifache Wittig-Reaktion|journal = Chem. Ber.|volume = 99|issue = 2|pages = 634–641|year = 1966|doi=10.1002/cber.19660990238|language = German}}