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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Protecting Groups for Aldehydes and Ketones: Introduction01:23

Protecting Groups for Aldehydes and Ketones: Introduction

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Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

4.3K
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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

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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
Protection of Alcohols02:31

Protection of Alcohols

7.3K
This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
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Inert Transition Metal Ion Complexes in Organic Synthesis: Protection and Activation.

Paul S Donnelly1, Jack M Harrowfield2, George A Koutsantonis3

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Chemistry, an Asian Journal
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Metal ion complexes with functionalized sarcophagines show unique structures sensitive to anions. Despite similar dimensions, reactive sites on substituents exhibit altered reactivity, acting as regioselective protecting groups.

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cage aminecomplexhydrogen bondingmetalsarcophagine

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Sarcophagines (sar) are macrocyclic ligands forming unique metal ion complexes.
  • Understanding metal-ligand interactions and substituent reactivity is crucial in coordination chemistry.

Purpose of the Study:

  • To investigate the structural characteristics of various metal ion complexes with functionalized sarcophagines.
  • To analyze the influence of counter anions on complex conformation.
  • To explore the reactivity of functionalized substituents within these metal complexes.

Main Methods:

  • Single-crystal X-ray diffraction studies.
  • Hirshfeld surface analysis to examine intermolecular interactions.

Main Results:

  • Unique metal ion/sarcophagine unit conformations were observed for different metals, influenced by counter anions.
  • Complex dimensions and substituent bond lengths/angles were similar to isolated components.
  • Substituents with reactive sites displayed significantly altered reactivity compared to uncoordinated substrates.

Conclusions:

  • Metal ions act as regioselective protecting groups due to the kinetic inertness of the complexes.
  • Hirshfeld surface analysis provides insights into reactivity differences.
  • The study elucidates the interplay between metal coordination, ligand structure, and substituent reactivity.