How to identify Tautomer's | Tautomerism |

Описание: Tautomerism
Tautomerism is a special type of isomerism in which a single compound exists in two (or more) rapidly interconvertible structural forms (called tautomers) that differ mainly in the position of a proton (H⁺) and a double bond.

These tautomers are in dynamic equilibrium with each other.
Desmotropism
Definition: A special case of tautomerism, where the tautomers coexist in equilibrium, but do not interconvert under normal conditions (i.e., the equilibrium is "frozen").

Key Feature: Static mixture of tautomers that do not readily convert into each other.

Reason: Often due to high activation energy or steric hindrance.

Common in: Some dyes and pigments, where both tautomers are stable enough to exist side-by-side but can’t interconvert easily.

🧠 Summary Table
Feature Tautomerism Desmotropism
Type of Isomerism Dynamic (reversible interconversion) Static (non-interconverting)
Interconversion Yes, fast and reversible No (or very slow)
Example Keto-enol tautomerism Some azo dyes, nitrophenols
Coexistence Usually one form dominates Both forms may coexist stably
Biological/Chemical Use Very common (biochem, org chem) More niche (dyes, analytical chem)
✅ Bottom Line

Tautomerism = interconverting isomers (fast equilibrium).

Desmotropism = non-interconverting tautomers (coexist but don't equilibrate easily).
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