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Arthur Eichengrün (August 13, 1867 – December 23, 1949) was a German Jewish chemist, materialists scientist, and inventor, best known through a controversy about who invented aspirin. He is also known for developing the highly successful anti-gonorrhea drug Protargol, the standard treatment for 50 years until the adoption of antibiotics, and for his pioneering contributions in plastics: co-developing (with Theodore Becker) the first soluble cellulose acetate materials in 1903, called "Cellit", and creating processes for the manufacture of these materials which were influential in the development of injection moulding. During World War I his relatively non-inflammable synthetic cellulose acetate lacquers, marketed under the name "Cellon", were important in the aircraft industry. He also contributed to photochemistry by inventing the first process for the production and development of cellulose acetate film, which he patented with Becker.
Arthur Eichengrün was born in Aachen as the son of a Jewish cloth merchant and manufacturer. In 1885, he took up studies in chemistry at the University of Aachen, later moved to Berlin, and finally to Erlangen, where he received a doctoral degree in 1890.
In 1896, he joined Bayer, working in the pharmaceutical laboratory. In 1908, he quit Bayer and founded his own pharmaceutical factory, the Cellon-Werke in Berlin. His company was "Aryanized" by the Nazis in 1938.
In 1943, he was arrested and sentenced to four months in prison for having failed to include the word "Israel" in his company's name (Nazi law required Jewish companies be identified as such). In May 1944, he was arrested again on the same charge and deported to the concentration camp Theresienstadt, where he spent 14 months until the end of World War II in Europe, escaping death.
Eichengrün has made his name through numerous inventions, such as processes for synthesizing chemical compounds. Aside from Aspirin, Eichengrün held 47 patents. Bayer's official story credits Felix Hoffmann, a young Bayer chemist, with the invention of aspirin in 1897. Impure acetylsalicylic acid (ASA, the active compound of aspirin) had been synthesized already in 1853 by French chemist Charles Frédéric Gerhardt; the 1897 process developed at Bayer was the first to produce pure ASA that could be used for medical purposes.
Due to the rise of the Nazis in Germany, Eichengrün was unable to object when Hoffman first made the claim that he (Hoffman) invented aspirin, in the footnote of a 1934 German Encyclopedia. Hoffman's claim was once widely accepted, but many historians now consider it to be discredited. Eichengrün first claimed to have invented aspirin in a 1944 letter from Theresienstadt concentration camp, addressed to IG Farben (of which Bayer was a part), where he cited his many contributions to the company (which was highly influential in the concentration camps), including the invention of aspirin, as reasons for why he should be released.
Five years later, Arthur Eichengrün published a paper in Pharmazie in 1949, where he explained that he had instructed Hoffmann to synthesise acetylsalicylic acid and that the latter had done so without knowing the purpose of the work. The paper elucidated how he planned and directed the synthesis of aspirin along with the synthesis of several related compounds, describing these events in detail. He also claimed to be responsible for aspirin's initial surreptitious clinical testing. Finally, he explained that Hoffmann's role was restricted to the initial lab synthesis using his (Eichengrün's) process and nothing more.
Eichengrün's account was ignored by historians and chemists until 1999, when Walter Sneader of the Department of Pharmaceutical Sciences at the University of Strathclyde in Glasgow re-examined the case and came to the conclusion that indeed Eichengrün's account was convincing and correct and that Eichengrün deserved credit for the invention of aspirin. Bayer denied this in a press release, asserting that the invention of aspirin was due to Hoffmann.
In 1897, protargol, a silver salt of a protein mixture, developed by Eichengrün at Bayer, was introduced as a new drug against gonorrhea. Protargol stayed in use until sulfa drugs and then antibiotics became available in the 1940s.
In 1903, Eichengrün co-developed the first soluble form of cellulose acetate with Theodore Becker. He went on to develop processes for the manufacture of cellulose acetate materials and devoted the rest of his life to the technical and economic development of plastics, lacquers, enamels, and artificial fibers based on cellulose acetate. During World War I his relatively non-inflammable synthetic cellulose acetate lacquers were important in the aircraft industry. He also pioneered the influential technique of injection moulding. In 1904, He created and patented the first safety film with Becker, (cellulose diacetate) from a process they devised in 1901 for the direct acetylation of cellulose at a low temperature to prevent its degradation, which permitted the degree of acetylation to be controlled, thereby avoiding total conversion to its triacetate. Cellit was a stable, non-brittle cellulose acetate polymer that could be dissolved in acetone for further processing. It was used to manufacture cellulose diacetate cinematographic film, which Eastman Kodak and the Pathé Fréres began to use in 1909. Cellulose acetate film became the standard in the 1950s, preferred over the highly flammable and unstable nitrate film (better known as celluloid).
- Eichengrün A. 50 Jahre Aspirin. Pharmazie 1949;4:582-4. (in German)
- Sneader, W (2000). "The discovery of aspirin: a reappraisal". BMJ (Clinical research ed.) 321 (7276): 1591–4. doi:10.1136/bmj.321.7276.1591. PMC 1119266. PMID 11124191.
- Vaupel, E (2005). "Arthur Eichengrün--tribute to a forgotten chemist, entrepreneur, and German Jew". Angewandte Chemie (International ed. in English) 44 (22): 3344–55. doi:10.1002/anie.200462959. PMID 15798983.
- Arthur Eichengrün in the Complete Dictionary of Scientific Biography
- Sneader's paper crediting Eichengrün with the invention of aspirin in the British Medical Journal.
- Bayer's press release denying this at the Wayback Machine (archived September 28, 2007) (German)
- Wer hat es erfunden? (Who invented it?) (German)