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Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism01:14

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The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom...
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The Wittig reaction is the conversion of carbonyl compounds-aldehydes and ketones-to alkenes using phosphorus ylides, or the Wittig reagent. The reaction was pioneered by Prof. Georg Wittig, for which he was awarded the Nobel Prize in Chemistry.
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Overview of Advanced Functional Groups02:22

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Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
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sp3d and sp3d 2 Hybridization
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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Related Experiment Video

Updated: Apr 15, 2026

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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The first zinc phosphite with remarkable structural and functional transformations.

Chih-Min Wang1, Tsung-Yuan Chang, Li-Wei Lee

  • 1Department of Chemistry, National Central University, Jhongli, 320, Taiwan. twcmwang@gmail.com liikh@cc.ncu.edu.tw.

Chemical Communications (Cambridge, England)
|April 9, 2015
PubMed
Summary
This summary is machine-generated.

A novel zinc phosphite undergoes structural changes when heated, forming new dehydrated structures. These materials show potential for gas adsorption and in light-emitting diode (LED) devices.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Zinc phosphites are known for their diverse structures and potential applications.
  • Structural transformations in metal-organic frameworks can lead to tunable properties.

Purpose of the Study:

  • To synthesize and characterize a new zinc phosphite material.
  • To investigate its structural transformations under thermal stimulation.
  • To evaluate its gas adsorption and luminescence properties for potential applications.

Main Methods:

  • Synthesis of a novel zinc phosphite.
  • Thermal analysis to induce structural transformations.
  • X-ray diffraction for structural characterization.
  • Gas adsorption measurements (e.g., N2 adsorption).
  • Fabrication and testing of LED devices using the material.

Main Results:

  • A new zinc phosphite was successfully synthesized.
  • Remarkable structural transformations were observed upon heating, yielding a dehydrated form (NCU-2a) and a new structure (NCU-2b).
  • The material demonstrated promising gas adsorption capabilities and luminescence properties suitable for LED applications.

Conclusions:

  • The synthesized zinc phosphite exhibits dynamic structural behavior in response to heat.
  • The resulting materials possess properties beneficial for gas storage and optoelectronic devices.
  • This study highlights the potential of phosphite-based materials in advanced applications.