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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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In structural engineering, the equilibrium of a system is not only determined by its equations of equilibrium but also with the help of constraints. Constraints refer to restrictions on the motion of a system. The proper combinations of constraints can minimize the total number of constraints needed to maintain a system in mechanical equilibrium. When this happens, the system is said to be statically determinate. For such systems, the unknown reaction supports can be estimated using equilibrium...
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BenzAI: A Program to Design Benzenoids with Defined Properties Using Constraint Programming.

Adrien Varet1, Nicolas Prcovic1, Cyril Terrioux1

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Summary

BenzAI automatically generates complex benzenoid structures with specific constraints and computes their aromaticity. This tool aids in exploring chemical structures and their properties, including IR spectra for smaller molecules.

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Area of Science:

  • Computational Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Benzenoids are fundamental polycyclic aromatic hydrocarbons.
  • Automated generation of benzenoids with precise structural control is challenging.
  • Understanding benzenoid properties like aromaticity is crucial in chemistry.

Purpose of the Study:

  • To introduce BenzAI, a novel program for automated benzenoid generation.
  • To enable the design of benzenoids based on diverse structural and electronic criteria.
  • To facilitate the study of benzenoid properties, including IR spectra and local aromaticity.

Main Methods:

  • Development of BenzAI software for benzenoid structure generation.
  • Implementation of algorithms for defining structural constraints (e.g., ring count, symmetry, Kekulé structures).
  • Generation of an IR spectra database for benzenoids with <10 rings.
  • Computation of local aromaticity using circuit-based algorithms for various species.

Main Results:

  • BenzAI successfully generates benzenoids meeting user-defined structural specifications.
  • The program allows for both automatic and manual construction of benzenoids.
  • IR spectra can be extracted for benzenoids with up to 10 rings.
  • Local aromaticity is computed for closed-shell and monoradical benzenoid species.

Conclusions:

  • BenzAI provides a versatile platform for exploring the chemical space of benzenoids.
  • The tool simplifies the creation and analysis of complex benzenoid structures.
  • BenzAI is valuable for research in organic chemistry, materials science, and computational chemistry.