Wöhler: artificial formation of urea from ammonium cyanate
The laboratory preparation of urea, a substance characteristic of a living organism, from ammonium cyanate. Textbook tradition treats it as the moment of the 'death of vitalism', but that tradition itself took shape later.
The German chemist Friedrich Wöhler in 1828, trying to prepare ammonium cyanate, found that the product was identical to urea from urine, and wrote to Berzelius that he could make urea 'without need of a kidney or even an animal'. The historian of chemistry Ramberg singles out three real meanings of the experiment: precise elemental analysis, a new example of what would later be called isomerism, and the impossibility of 'killing' vitalism with a single experiment (vitalism was not a single doctrine).
Neither in the paper nor in the correspondence did Wöhler claim a refutation of the vital force; the starting materials were themselves of organic origin (as McKie pointed out as early as 1944). The myth of the 'death of vitalism' formed later: the first printed version in Kopp (1843, 1847), the canon in Hofmann's obituary (1882). According to Ramberg, the myth lived on because it gave organic chemistry autonomy from physiology.
Why this date
high: letter to Berzelius of 22 February 1828, paper in Annalen der Physik und Chemie, vol. 88 (Poggendorff's vol. 12), no. 2, pp. 253-256
Other links
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Berzelius: organic substances are formed by a vital force (Lebenskraft)
refuted by · Confidence: low
The synthesis of urea from ammonium cyanate (inorganic by the classification of the time) is traditionally regarded as the refutation of the doctrine of vital force; historians reject this.
Dispute: A textbook case. The textbook thesis: the 1828 experiment "killed" vitalism. What historians say. (1) McKie (Nature, 1944): there was no synthesis in the strict sense (the starting materials were of organic origin), "chemists continued to assert the existence of vital force"; those who believe that "Wohler drove vitalism out of organic chemistry will believe anything". (2) Brooke (Ambix, 1968): the famous passages of the correspondence "referred to the transformation of a salt to a non-salt, and the identical elemental composition, and not mainly to the absence of vital functions". (3) Ramberg (Ambix, 2000): Wöhler himself nowhere mentions vitalism in the paper ("Nowhere in the paper did Wohler mention explicity any impact of the synthesis on vitalism"); Berzelius's reply concerned the oddity of the salt's transformation ("It is a very odd circumstance, that the nature of the salt so completely disappears when the acid and ammonia unite") and did not raise the question of the vital force; in the Lehrbuch of 1837 Berzelius still describes the Lebenskraft without a single reference to Wöhler; Liebig in 1837 noted the preparation of urea "without the assistance of the vital functions" but "said very little about the fate of the vital force"; vitalism "had as many definitions as adherents and served widely different functions, such that it could never be refuted by anyone experiment". (4) Vitalism lived on in chemistry and biology: Pasteur on fermentation, Driesch in the 20th century (SEP: "some researchers continued to develop vitalist theories well into the 20th century"). Bottom line: the claim that Wohler's experiment refuted vitalism should itself be treated as contested, and the real line runs to isomerism and to the disciplinary independence of organic chemistry. (5) The myth itself formed after the experiment: the first printed version in Kopp (Geschichte der Chemie, 1843 and 1847), "most likely derived from private verbal claims made by Wohler himself, or by Wohler's close friend Liebig" (Ramberg); Kolbe's textbook of 1854 supplied the prototype and Hofmann's obituary of 1882 fixed the canon; Cohen and Cohen (1996) showed that textbooks repeated it to the end of the 20th century. Ramberg explains the myth's persistence by its function: autonomy of organic chemistry from physiology, synthesis as the discipline's defining practice, a national narrative and pedagogical convenience.
Link sources
- Wöhler -> Berzelius, 22 1828, Ramberg 2000 (1828)
I can make urea without need of a kidney or even an animal, be it man or dog.
- Ramberg 2000 (2000)
Historians now agree that the synthesis, at least by itself, could have had, and indeed had, little real impact on vitalism.
- Ramberg 2000 1837 (2000)
the vital force was still very much a reality for Berzelius
- SEP, Life (2023) Verified 20 Sep 2026
Students sometimes learn about Friedrich Wöhler's synthesis of urea from ammonium cyanate. A cartoon version of history has that event as the ultimate death knell of vitalism, though the view persisted for decades afterward.
- Ramberg 2000 (2000)
The earliest known published formulation of the Wohler Myth appeared fifteen years after the event, in the first (1843) and fourth (1847) volumes of Hermann Kopp's Geschichte der Chemie.
- Ramberg 2000 (2000)
organic chemistry should be regarded as an autonomous discipline with its own aims and explanatory methods
"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.
Further reading
Not evidence: these carry no quotation and support nothing we wrote. They are books and scans to read next.
- Wöhler -> Berzelius, 22 1828, Ramberg 2000 (1828)
Links under review
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Berzelius introduces the concept of isomerism
influenced · Confidence: high
The link rests on the same paywalled Ramberg 2000 (Ambix 47(3)); we currently cite a personal upload on academia.edu, whose HTML carries only the abstract. No historian asserting this link in open access was found: Esteban (J. Chem. Educ. 85, 1201) and Brooke (BJHS) are paywalled too. The 1828 and 1830 primary sources are available but do not themselves assert the link.
Wöhler's experiment supplied a concrete new example of substances with the same composition and different properties, which entered the foundation of the concept of isomerism.
Link sources
- Ramberg 2000 (2000)
provided a concrete new example of what would later be called isomerism
- Wöhler 1828, Ramberg 2000 (1828)
two entirely different bodies could contain the same proportions of the same elements, and only a dissimilar kind of union brings out the peculiarities
- Ramberg 2000 (2000)
Node sources
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
...for I cannot, so to speak, hold my chemical water, and must tell you that I can make urea without need of a kidney or even an animal, be it man or dog. [Friedrich Wohler to Jakob Berzelius, February 22, 1828]
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
After considering Benfey’s, Lipman’s and Brooke’s arguments, we are left with three principal historically significant aspects of the Wohler synthesis. First, Wohler displayed considerable experimental ability in providing an accurate elemental analysis of synthetic and natural urea that demonstrated unequivocally that they had the same elemental composition. Second, his accurate elemental analyses of synthetic urea showed that it had the same composition as ammonium cyanate, and therefore provided a concrete new example of what would later be called isomerism. ... Third, the synthesis could not destroy the foundations of vitalism, for the concept of “vitalism” had as many definitions as adherents and served widely different functions, such that it could never be refuted by any one experiment.
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
Although he was clearly excited about his unexpected result, Wohler refrained from speculating on the importance or significance of the synthesis either in the published paper or in his letter to Berzelius. ... Nowhere in the paper did Wohler mention explicity any impact of the synthesis on vitalism.
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
The earliest known published formulation of the Wohler Myth appeared fifteen years after the event, in the first (1843) and fourth (1847) volumes of Hermann Kopp’s Geschichte der Chemie. ... it seems probable that he wrote up the story because he believed it to be a true account of the meaning of Wohler’s synthesis, most likely derived from private verbal claims made by Wohler himself, or by Wohler’s close friend Liebig.
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
Kolbe developed the views expressed in this three-page dictionary article in the introduction to his 1854 Lehrbuch der organischen Chemie. In his “General Considerations,” Kolbe laid out what was to become the prototype for nearly all textbook accounts of the Wohler Myth.
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
Perhaps the most famous of the Wohler obituaries, for a long time taken as the first appearance of the Myth, was by A.W. Hofmann, who labelled the synthesis as an “epochal discovery,” that was greeted with “jubilation” as it unified chemistry.
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
In other words, organic chemistry should be regarded as an autonomous discipline with its own aims and explanatory methods. ... Another reason for later generations of nineteenth century chemists to focus on the urea synthesis as a founding moment is its role as a synthesis. By the mid- to late nineteenth century, the synthesis of organic compounds had become central to the science of organic chemistry.
- Ramberg P. J. Ambix 47(3), 170-195 (2000)
Wohler did not sound the “death-knell” for vitalism, McKie argued, because his starting materials were derived from organic materials. He had not therefore performed a true total synthesis of urea directly from the elements.
- McKie D. Wöhler's 'Synthetic' Urea and the Rejection of Vitalism: A Chemical Legend. Nature 153: 608-610 (1944) Verified 20 Sep 2026, quotation assembled from fragments
THAT Wöhler synthetized urea in 1828 and thereby rang the death-knell of vitalism in organic chemistry seems to be as firmly established a legend as that Galileo let fall at one and the same time from the leaning tower at Pisa two unequal weights... But, as in the earlier, so in the later case, the facts are otherwise: there was no synthesis of urea, and chemists continued to assert the existence of vital force and to describe its role in the formation of organic substances.
"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong. "Assembled from fragments" means the words do not stand together on the page: we found each fragment separately and joined them with an ellipsis.
Further reading
Not evidence: these carry no quotation and support nothing we wrote. They are books and scans to read next.
- Wöhler F. Ueber künstliche Bildung des Harnstoffs. Annalen der Physik und Chemie, Bd. 88, Heft 2, S. 253-256, DOI 10.1002/andp.18280880206 (1828)
- Brooke J.H. Wöhler's Urea, and its Vital Force: A Verdict from the Chemists. Ambix 15 (2), 84-114 (1968)
- Cohen P.S., Cohen S.M. Wöhler's Synthesis of Urea: How Do the Textbooks Report It? J. Chem. Educ. 73(9): 883 (1996)
- SEP, Life (2023)