Leidenin

Leidenin is a name that has appeared in limited scientific and educational contexts as a purported chemical compound. It is not recognized as a defined substance in major chemical databases, and there is no universally accepted structure or CAS number associated with the term. The origin of the name is unclear, but it is sometimes linked to Leiden, the Dutch city and university, where it has occasionally been used in teaching materials as an example of nomenclature or reaction design. Because no authoritative identity exists, the term has sometimes been used as a placeholder in discussions of synthetic routes, functional-group transformations, or medicinal chemistry hypotheticals.

Usage and status vary across sources. In materials that mention Leidenin, depictions of the molecule differ and no standard preparation or isolation method is described. Because the term may function as a fictional or illustrative example rather than a real chemical, it typically carries no regulatory or safety data. Readers encountering Leidenin should consult primary sources or databases to determine whether a specific work assigns a concrete structure to the name. In most contexts, Leidenin serves as a placeholder rather than an established chemical entity.

See also: placeholder names in chemistry, fictitious compounds, IUPAC naming examples.