C4Testreaktion

C4Testreaktion is a term encountered in a small subset of German-language chemical literature. It refers, in the sources that use it, to a qualitative reaction or sequence of steps claimed to diagnose or characterize a substance labeled C4. There is no universally accepted definition, and the term is not part of standard chemical nomenclature.

Definition and usage vary by author. Some descriptions present C4Testreaktion as a specific colorimetric or precipitative test that yields a diagnostic observable change for substances designated as C4. Others use the phrase more broadly to denote a reaction pathway or diagnostic sequence associated with a broader class of compounds under the same label. Because of inconsistent usage, the term is often ambiguous outside its original publication.

Literature and history: The term appears in a limited number of mid- to late-20th-century German theses, conference abstracts, and niche reports. As a result, its interpretation tends to be source-dependent, and modern chemists rarely employ it in contemporary practice.

See also:

- Qualitative analysis

- Colorimetric test

- Reaction mechanism

Notes: This article summarizes limited, non-standard usage. For precise meaning, the reader should consult the original source where the term is used.