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Halogens03:01

Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Related Experiment Video

Updated: Aug 23, 2025

Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
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Fluorine on fluorenes.

Cody F Dickinson1, Justin K Yang1, Marcus A Tius1

  • 1Chemistry Department, University of Hawaii at Manoa, 2545 The Mall, Honolulu, HI 96822, USA. tius@hawaii.edu.

Organic & Biomolecular Chemistry
|October 31, 2022
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Summary
This summary is machine-generated.

Researchers developed a practical synthesis for fluorinated fluorenones and their brominated derivatives. This work enables new pathways for creating complex polyhalogenated aromatic compounds.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Fluorinated fluorenones are key precursors in synthesizing advanced polyhalogenated aromatic compounds.
  • Existing synthetic routes may lack practicality or efficiency for certain derivatives.

Purpose of the Study:

  • To develop a practical and efficient synthesis for 1,8-difluorofluorenone and its dibromo and tetrabromo derivatives.
  • To establish a novel strategy for converting these fluorinated fluorenones into complex polycyclic aromatic hydrocarbons.

Main Methods:

  • Developed a practical synthetic route for 1,8-difluorofluorenone.
  • Synthesized 2,7-dibromo- and 2,4,5,7-tetrabromo-1,8-difluorofluorenone derivatives.
  • Employed a novel strategy to convert 2,7-dibromo-1,8-difluoro-9H-fluoren-9-one into a dibromodifluorodibenzo[g,p]chrysene.

Main Results:

  • Successfully synthesized 1,8-difluorofluorenone and its key brominated derivatives.
  • Demonstrated a novel conversion of a dibromodifluorofluorenone into a polycyclic aromatic system.
  • The synthesis provides accessible fluorinated fluorenone building blocks.

Conclusions:

  • A practical synthetic methodology for fluorinated fluorenones and their halogenated derivatives has been established.
  • This research opens new avenues for the synthesis of complex polyhalogenated dibenzochrysenes and geodesic hydrocarbons.
  • The developed methods offer valuable tools for constructing advanced fluorinated polycyclic aromatic systems.