Related Experiment Video
Updated: Aug 10, 2026
08:56
Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants
Published on: March 25, 2017
Benziporphyrins: exploring arene chemistry in a macrocyclic environment
Marcin Stepień1, Lechosław Latos-Grazyński
1Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, Wrocław 50383, Poland.
Accounts of Chemical Research
|February 16, 2005
Summary
Benziporphyrins, synthetic porphyrin analogues, offer tunable properties by modifying their structure. These versatile ligands enable the study of metal-arene interactions within a macrocyclic framework.
Area of Science:
- Synthetic organic chemistry
- Supramolecular chemistry
- Coordination chemistry
Background:
- Benziporphyrins are synthetic analogues of porphyrins, featuring a benzenoid ring replacing a pyrrole unit.
- The incorporation method of the arene influences the macrocycle's distinct physical and chemical properties.
Purpose of the Study:
- To investigate how structural modifications of benziporphyrins impact their aromaticity, tautomeric equilibria, and reactivity.
- To explore benziporphyrins as ligands for studying metal-arene interactions in a macrocyclic environment.
Main Methods:
- Synthesis of benziporphyrin analogues with varying structures.
- Spectroscopic characterization of the synthesized compounds.
- Coordination studies with metal ions.
Main Results:
- Structural modifications allow fine-tuning of benziporphyrin properties.
- Benziporphyrins effectively coordinate metal ions.
- Coordination facilitates metal-arene interactions, including C-H bond activation and weak interactions, observable spectroscopically.
Conclusions:
- Benziporphyrins are versatile macrocyclic ligands with tunable properties.
- They provide a unique platform for investigating metal-arene chemistry.
- Spectroscopic methods can detect metal-induced changes in the arene fragment.
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
Related Concept Videos
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
01:17Thermal Electrocyclic Reactions: Stereochemistry
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
01:16Cycloaddition Reactions: Overview
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.
01:18Aromatic Hydrocarbon Anions: Structural Overview
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Due to the absence of continuous overlap of p...
01:18Aromatic Hydrocarbon Cations: Structural Overview
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Removing one hydrogen from the intervening CH2 group with both...
01:29Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.