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Related Concept Videos

Carbocations02:10

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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Aromatic 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...
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.
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Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
C–C Bond Formation: Aldol Condensation Overview01:10

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Prochirality02:05

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Ab initio characterization of C5.

H Massó1, V Veryazov, P-A Malmqvist

  • 1Department of Theoretical Chemistry, Lund University, Chemical Center, P.O. Box 124, S-221 00 Lund, Sweden.

The Journal of Chemical Physics
|October 24, 2007
PubMed
Summary
This summary is machine-generated.

This study determined the structure and spectroscopic parameters of the C5 cluster using quantum chemical methods. The findings validate astrophysical observations and confirm a stable linear isomer of C5.

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Area of Science:

  • Computational chemistry
  • Astrophysics
  • Spectroscopy

Background:

  • The carbon cluster C5 has been observed in astrophysical settings, but its precise structure and spectroscopic properties require detailed theoretical investigation.
  • Previous astrophysical observations have suggested the presence of C5, necessitating theoretical validation.

Purpose of the Study:

  • To determine the structure and spectroscopic parameters of the C5 cluster using advanced quantum chemical methods.
  • To validate previous astrophysical observations of C5 by comparing theoretical predictions with experimental data.
  • To explore the potential energy surface of C5 to identify stable isomers and their electronic ground states.

Main Methods:

  • Utilized multiconfigurational quantum chemical methods, specifically CASPT2 (multiconfigurational second order perturbation theory), with extensive basis sets.
  • Calculated spectroscopic properties including band center positions, l-doubling parameters, and rotational constants for the linear C5 isomer.
  • Derived an anharmonic force field from a grid of 1350 geometries to analyze the infrared spectrum.

Main Results:

  • Confirmed the prominent stability of the linear X1Σg+ isomer of C5.
  • Identified at least three other minimum energy structures, including cyclic and nonplanar geometries.
  • Calculated the anharmonic fundamental of the ν7(πu) mode at 102 cm⁻¹, validating ISO telescope observations.

Conclusions:

  • The theoretical calculations strongly support the assignment of the observed spectral features to the C5 cluster.
  • The study provides a comprehensive understanding of C5's structure, stability, and spectroscopic characteristics.
  • This work bridges theoretical chemistry and observational astrophysics, aiding in the identification of interstellar molecules.