Amidein

Amidein is not a standard term recognized in contemporary chemical nomenclature. It does not correspond to a clearly defined functional group or class with a fixed structure in major dictionaries or databases. In many cases, the term may arise from a misspelling, transcription error, or regional/archaic usage, and without a cited source its meaning remains ambiguous. When encountered, it is important to consult the original reference to determine the intended concept.

If a source intends the term amidine, then the discussion shifts to a well-defined class of compounds. Amidines contain the amidine functional group, typically written as RC(=NH)NR'2, and are known for their basicity and ability to form amidinium salts. They are used as bases, catalysts, ligands, and as motifs in medicinal chemistry and heterocyclic synthesis. Common examples include benzamidine and formamidine derivatives. Amidines can be prepared by various routes, such as condensation of nitriles with amines under dehydrating conditions, or by transformations of formamides and related precursors.

In summary, "amidein" does not have a universally accepted definition in chemistry. If it appears in literature, it is advisable to verify the intended meaning with the original source and to consider that it may refer to amidine, or, less likely, to the broader family of amide-containing compounds. See also amide, amidine, amide bond, nitrile.