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Related Concept Videos

Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives01:35

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Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

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The Polymorphs of Diacetylcurcumin (DAC).

Marco A Obregón-Mendoza1, Rosario Tavera-Hernández1, Rubén Sánchez-Obregón1

  • 1Instituto de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico.

Molecules (Basel, Switzerland)
|June 26, 2026
PubMed
Summary

Researchers discovered new crystal forms of diacetylcurcumin, expanding knowledge of curcuminoid polymorphism. Solid-state NMR and X-ray diffraction confirmed the structures of these novel polymorphs.

Keywords:
DACdiacetylcurcuminpolymorphism

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Area of Science:

  • Crystallography
  • Solid-state Chemistry
  • Materials Science

Background:

  • Curcuminoids, including diacetylcurcumin, are a class of compounds with potential therapeutic applications.
  • Polymorphism, the ability of a solid material to exist in multiple crystalline forms, can significantly impact a compound's physical and chemical properties.
  • Understanding the polymorphic landscape of diacetylcurcumin is crucial for its development and application.

Purpose of the Study:

  • To identify and characterize new crystalline polymorphs of diacetylcurcumin.
  • To investigate the influence of solvent mixtures on the formation of diacetylcurcumin polymorphs.
  • To establish reliable methods for exploring the polymorphism of curcuminoids.

Main Methods:

  • Synthesis of diacetylcurcumin polymorphs using various solvent mixtures.
  • Solid-state Nuclear Magnetic Resonance (CP-MAS NMR) spectroscopy for structural elucidation.
  • X-ray diffraction (XRD) studies to determine crystal structures and space groups.
  • Morphological crystal analysis using microscopy.
  • Attenuated Total Reflectance Infrared (ATR-IR) spectroscopy for rapid characterization.

Main Results:

  • Two new polymorphs of diacetylcurcumin were successfully synthesized and characterized, in addition to the known monoclinic form.
  • Polymorph 2 (monoclinic, space group P21/n) exhibits a canoe-shaped conformation.
  • Polymorph 3 (triclinic, space group P-1) adopts a balloon-shaped conformation.
  • The study demonstrated that microscopy and ATR-IR spectroscopy are efficient tools for exploring curcuminoid polymorphism.

Conclusions:

  • The research expands the known polymorphic forms of diacetylcurcumin, contributing to a deeper understanding of its solid-state behavior.
  • The findings highlight the importance of solvent selection in controlling crystal polymorphism.
  • The developed methods offer a practical approach for future investigations into the polymorphism of related curcuminoid derivatives.
  • This work encourages further exploration in curcumin derivative research for chemists and materials scientists.