Rainer Ludwig Claisen

German chemist best known for his work with condensations of carbonyls and sigmatropic rearrangements (1851–1930)
Person human Q65135
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Summary

Rainer Ludwig Claisen was born on January 14, 1851[1], in Cologne[2]. He died on January 5, 1930[3], in Bad Godesberg[4]. He worked as a chemist[5] and university teacher[6]. He ranks in the top 0.73% of human entities by monthly Wikipedia readership (164 views/month, #7,296 of 1,000,298).[7]

Key Facts

  • Mother: Emilia Claisen[8]
  • Country of citizenship: Germany[9]
  • Field of work: organic chemistry[10]
  • Employer: Kiel University[11], RWTH Aachen University[12], University of Bonn[13]
  • Educated at: University of Bonn[14]
  • Doctoral advisor: August Kekulé[15]
  • Member of: German Academy of Sciences Leopoldina[16], Bavarian Academy of Sciences and Humanities[17], Katholischer Studentenverein Arminia Bonn[18]
  • Sex or gender: male[19]
  • Commons category: Ludwig Claisen[20]
  • Given name: Ludwig[21]
  • Work location: Aachen[22]
  • Described by source: Great Soviet Encyclopedia (1969–1978)[23], Armenian Soviet Encyclopedia, vol. 5[24]
  • Languages spoken, written or signed: German[25]
  • Name in native language: Ludwig Claisen[26]

Body

Works and Contributions

Things named for Rainer Ludwig Claisen include Claisen condensation[27], an eponymous chemical reaction[28]; Claisen rearrangement[29], an eponymous chemical reaction[30]; Claisen-Schmidt condensation[31], an eponymous chemical reaction[32]; Tishchenko reaction[33], an eponymous chemical reaction[34]; and Ireland–Claisen rearrangement[35], a type of chemical reaction[36].

Why It Matters

Rainer Ludwig Claisen has Wikipedia articles in 10 language editions, a strong signal of global cultural recognition.[37] He is known by 15 alternative names across languages and contexts.[38]

Entities named for him include Claisen condensation[27], an eponymous chemical reaction[28]; Claisen rearrangement[29], an eponymous chemical reaction[30]; Claisen-Schmidt condensation[31], an eponymous chemical reaction[32]; Tishchenko reaction[33], an eponymous chemical reaction[34]; and Ireland–Claisen rearrangement[35], a type of chemical reaction[36].

FAQs

Where was Rainer Ludwig Claisen born?

Rainer Ludwig Claisen was born in Cologne[2].

Where did Rainer Ludwig Claisen die?

Rainer Ludwig Claisen died in Bad Godesberg[4].

Who were Rainer Ludwig Claisen's parents?

Rainer Ludwig Claisen's mother was Emilia Claisen[8].

What did Rainer Ludwig Claisen do for work?

Rainer Ludwig Claisen worked as a chemist[5] and university teacher[6].

Where did Rainer Ludwig Claisen go to school?

Rainer Ludwig Claisen was educated at University of Bonn[14].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . Great Norwegian Encyclopedia. Retrieved . wikidata.org.
  2. [4] ↑ . Great Soviet Encyclopedia (1969–1978). Retrieved . wikidata.org.
  3. [19] ↑ . Integrated Authority File. Retrieved . wikidata.org.
  4. [8] ↑ . wikidata.org.
  5. [9] ↑ . wikidata.org.
  6. [14] ↑ . wikidata.org.
  7. [10] ↑ . wikidata.org.
  8. [5] ↑ . wikidata.org.
  9. [6] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . Retrieved . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [20] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . wikidata.org.
  18. [1] ↑ . Integrated Authority File. Retrieved . wikidata.org.
  19. [3] ↑ . Integrated Authority File. Retrieved . wikidata.org.
  20. [21] ↑ . wikidata.org.
  21. [22] ↑ . wikidata.org.
  22. [23] ↑ . wikidata.org.
  23. [24] ↑ . wikidata.org.
  24. [25] ↑ . wikidata.org.
  25. [26] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [27] ↑ . wikidata.org. → on this site
  2. [29] ↑ . wikidata.org. → on this site
  3. [31] ↑ . wikidata.org. → on this site
  4. [33] ↑ . wikidata.org. → on this site
  5. [35] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [28] ↑ . Wikidata. wikidata.org. → on this site
  2. [30] ↑ . Wikidata. wikidata.org. → on this site
  3. [32] ↑ . Wikidata. wikidata.org. → on this site
  4. [34] ↑ . Wikidata. wikidata.org. → on this site
  5. [36] ↑ . Wikidata. wikidata.org. → on this site

Aggregate / graph-position facts

  1. [7] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [37] ↑ . Wikidata sitelinks. wikidata.org.
  3. [38] ↑ . Wikidata aliases. wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Rainer Ludwig Claisen. Retrieved October 20, 2026, from https://4ort.xyz/entity/rainer-ludwig-claisen
MLA “Rainer Ludwig Claisen.” 4ort.xyz Knowledge Graph, 4ort.xyz, 20 Oct. 2026, https://4ort.xyz/entity/rainer-ludwig-claisen.
BibTeX @misc{4ortxyz_rainer-ludwig-claisen_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Rainer Ludwig Claisen}}, year = {2026}, url = {https://4ort.xyz/entity/rainer-ludwig-claisen}, note = {Accessed: 2026-10-20}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Rainer Ludwig Claisen — https://4ort.xyz/entity/rainer-ludwig-claisen (retrieved 2026-10-20)

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Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 2d ago · OKA bot bot · 2026-10-17 view diff on Wikidata ↗
    Wikipedia languages → ['ar', 'arz', 'azb', 'ca', 'commons', 'de', 'en', 'eo', 'fa', 'fr', 'hy', 'it',
    Claims rich → —
    "/* wbeditentity-statements-multiple-properties-update:0||3 */ source for place of birth, source for date of birth, source for date of death from Store norske leksikon ([[Wikidata:Requests for permissi"
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