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Related Concept Videos

Hydrolysis01:15

Hydrolysis

Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Methods of Sterilization II: Chemical Methods01:30

Methods of Sterilization II: Chemical Methods

In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements.
Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...

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One-pot Microwave-assisted Conversion of Anomeric Nitrate-esters to Trichloroacetimidates
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Microwave-assisted one-pot hydrostannylation/Stille couplings.

R E Maleczka1, J M Lavis, D H Clark

  • 1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA. maleczka@cem.msu.edu

Organic Letters
|November 14, 2000
PubMed
Summary

Microwave-accelerated reactions efficiently convert 1-alkynes into 1,3-dienes or styrenes using a one-pot hydrostannylation/Stille coupling method. This approach significantly reduces reaction times compared to traditional techniques.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Catalysis

Background:

  • Traditional methods for synthesizing 1,3-dienes and styrenes from 1-alkynes are often time-consuming and involve multiple steps.
  • Hydrostannylation and Stille coupling are important reactions in organic synthesis, but their combined application can be challenging.

Purpose of the Study:

  • To develop a more efficient and faster method for the synthesis of 1,3-dienes and styrenes.
  • To explore the utility of microwave acceleration in a one-pot hydrostannylation/Stille coupling sequence.

Main Methods:

  • Utilizing microwave irradiation to accelerate a one-pot reaction sequence.
  • Employing hydrostannylation of 1-alkynes followed by Stille coupling in a single reaction vessel.

Main Results:

  • Efficient transformation of 1-alkynes into 1,3-dienes and styrenes was achieved.
  • The reaction proceeded in a fraction of the time required by conventional methods.
  • The one-pot procedure demonstrated high efficiency and yield.

Conclusions:

  • Microwave-accelerated one-pot hydrostannylation/Stille coupling is a highly efficient method for synthesizing 1,3-dienes and styrenes.
  • This streamlined approach offers a significant advantage in terms of reaction speed and simplicity over conventional synthetic routes.