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A method involving the transformation of methyl ketones to carboxylic acids using excess base and halogen is called the haloform reaction. It begins with the deprotonation of α hydrogen to form an enolate ion which reacts with the electrophilic halogen to give an α-halo ketone. The step continues until all the α protons are substituted to form a trihalomethyl ketone. The resulting molecule is unstable, and in the presence of a hydroxide base, it readily undergoes nucleophilic...
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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Two-Step, One-Flask Synthesis of a Meso-Substituted Phlorin.

Dongjoon Kim1, Hao-Jung Chun1, Christopher C Donnelly1

  • 1Colgate University , Department of Chemistry, 13 Oak Drive, Hamilton, New York 13346, United States.

The Journal of Organic Chemistry
|May 28, 2016
PubMed
Summary
This summary is machine-generated.

A streamlined one-flask synthesis of phlorins was developed using pyrrole, pentafluorobenzaldehyde, and acetone. This method offers easier access to phlorins compared to traditional routes, yielding up to 26% phlorin.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Porphyrinoid Synthesis

Background:

  • Traditional synthesis of phlorins and 5-isocorroles involves multi-step dipyrromethanecarbinol routes.
  • Streamlined synthetic strategies are needed for efficient porphyrinoid preparation.

Purpose of the Study:

  • To investigate a two-step, one-flask reaction of pyrrole with pentafluorobenzaldehyde and acetone.
  • To optimize conditions for synthesizing phlorin and/or 5-isocorrole.
  • To evaluate the potential for a simplified alternative to existing synthetic methods.

Main Methods:

  • Analytical-scale reactions were conducted to study the effects of reactant concentration, ratios, acid catalysts (TFA, BF3·OEt2), catalyst concentration, oxidant quantity, and reaction time.
  • Optimization of promising conditions for preparative-scale synthesis.
  • Exploration of alternative ketones (acetophenone, benzophenone) for phlorin synthesis.

Main Results:

  • Phlorin was consistently observed in yields up to 20-26%.
  • 5-Isocorrole was not detected under the investigated conditions.
  • Preparative scale synthesis yielded phlorin in 20-21% isolated yield.
  • Phlorin synthesis from acetophenone yielded 5%, while benzophenone yielded no detectable phlorin.

Conclusions:

  • A two-step, one-flask reaction provides a streamlined method for phlorin synthesis.
  • This approach simplifies access to phlorins, encouraging further research into pyrrole-aldehyde-ketone reactions.