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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.
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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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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.
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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
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BN-Embedded Perylenes.

Xiangdong Fang1

  • 1College of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.

Molecules (Basel, Switzerland)
|December 10, 2021
PubMed
Summary
This summary is machine-generated.

Two novel boron- and nitrogen-containing (BN) perylene derivatives were synthesized. These stable BN-perylenes exhibit enhanced π-π stacking, offering a new platform for advanced organic materials.

Keywords:
BN-aromaticsPAHscouplingpalladium catalysisperylene

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Perylene derivatives are crucial in organic electronics due to their photophysical properties.
  • Incorporating boron and nitrogen (BN) into aromatic systems can tune electronic and structural characteristics.
  • Developing novel BN-containing analogues of established chromophores is key for new material discovery.

Purpose of the Study:

  • To synthesize novel BN-perylene derivatives using transition metal-catalyzed coupling reactions.
  • To investigate the structural, packing, and photophysical properties of the synthesized BN-perylenes.
  • To explore the impact of BN-isosteric substitution on π-π stacking interactions and material stability.

Main Methods:

  • Synthesis via transition metal-catalyzed coupling of halogenated BN-naphthalene precursors.
  • Structural and packing analysis using Nuclear Magnetic Resonance (NMR) spectroscopy and X-ray single-crystal diffraction.
  • Photophysical characterization through UV-vis absorption and fluorescence spectroscopy.
  • Computational analysis using Density Functional Theory (DFT) calculations.

Main Results:

  • Successful synthesis of two novel BN-perylene compounds.
  • Confirmation of molecular structures and solid-state packing arrangements.
  • Observation of enhanced π-π stacking interactions in both solution and solid states compared to traditional perylenes.
  • Demonstration of high thermal and chemical stability for the synthesized BN-perylenes.

Conclusions:

  • The isosteric BN-insertion into the perylene core significantly enhances intermolecular π-π stacking.
  • The synthesized BN-perylenes possess excellent stability, making them promising candidates for advanced organic materials.
  • This work establishes a new synthetic strategy and a valuable molecular platform for designing novel BN-containing organic functional materials.