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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
3.4K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

6.1K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.1K
Directing Effect of Substituents: ortho–para-Directing Groups01:14

Directing Effect of Substituents: ortho–para-Directing Groups

6.7K
Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
6.7K
Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

5.5K
Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
5.5K
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

10.3K
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Recent Advances On Direct Formylation Reactions.

Aditya Kherudkar1, Angana Bhattacharjee1, Akash Nawkhare1

  • 1Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education & Research (NIPER) S.A.S. Nagar, 160062, Mohali, India.

Chemical Record (New York, N.Y.)
|May 25, 2023
PubMed
Summary

This review covers advanced direct formylation methods in organic synthesis. Newer techniques offer mild, inexpensive, and efficient ways to create valuable aldehyde intermediates, overcoming traditional limitations.

Keywords:
Dehydrogenative-Decarboxylative formylationFormylationN-formylationPhotocatalytic formylationhydroformylationsolvent free formylation

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Aldehydes are crucial functional groups and intermediates in organic synthesis.
  • Traditional formylation methods often have drawbacks that limit their efficiency and applicability.

Purpose of the Study:

  • To review and elaborate on advanced direct formylation reaction methodologies.
  • To highlight methods that overcome limitations of traditional formylation techniques.

Main Methods:

  • Review of recent literature on direct formylation reactions.
  • Discussion of methods employing homogeneous and heterogeneous catalysts.
  • Exploration of one-pot reactions and solvent-free techniques.

Main Results:

  • Advanced methods enable direct formylation under mild conditions.
  • Newer techniques utilize inexpensive resources and catalysts.
  • The reviewed methods offer improved efficiency and overcome drawbacks of older approaches.

Conclusions:

  • Modern direct formylation strategies provide efficient and sustainable routes to valuable aldehyde intermediates.
  • The development of novel catalytic systems and reaction conditions is key to advancing formylation chemistry.