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Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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.
Due to the absence of continuous overlap of p...
Structure and Nomenclature of Alcohols and Phenols02:23

Structure and Nomenclature of Alcohols and Phenols

Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and phenols...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated benzene...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...

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関連する実験動画

Updated: May 7, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

ピロガロール[4]は,挫折した有機固体として存在します.

Harshita Kumari1, Loredana Erra, Alicia C Webb

  • 1Department of Chemistry, University of Missouri-Columbia , 601 S. College Avenue, Columbia, Missouri 65211, United States.

Journal of the American Chemical Society
|September 18, 2013
PubMed
まとめ

研究者はC-ペンチルピロガロール[4]アレン (PgC5) を研究し,CO2の相互作用を含む7つの形態を発見した. ピロガロール[4]エレンは,物質科学に影響を及ぼす,挫折した有機固体としての潜在能力を示しています.

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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

関連する実験動画

Last Updated: May 7, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

科学分野:

  • 超分子化学 超分子化学
  • マテリアルサイエンス 材料科学
  • 固体化学 固体化学

背景:

  • 桁間隔の層構造は,超分子化学において極めて重要です.
  • ピロガロール[4]アレンは,ガス貯蔵における潜在的な応用を持つ化合物のクラスである.
  • 固体状態の行動とゲストの相互作用を理解することは,新しい材料の開発の鍵です.

研究 の 目的:

  • C-ペンチルピロガロール[4]アレン (PgC5) の層構造の構造的変化を解明する.
  • ホストとゲストの相互作用,特にCO2との相互作用を調査する.
  • ピロガロール[4]アレンの可能性を,挫折した有機固体として探求する.

主な方法:

  • 固体構造を分析するためのX線粉末微分法 (PXRD).
  • CO2の吸収と相互作用を研究するためのガス吸収技術.
  • 分子動力学シミュレーションは,分子配列と自己組み立てを理解するためのものです.

主要な成果:

  • PgC5の2つの異なる数字の間の層構造が構造的に特徴付けられました.
  • 分子ダイナミクスは,溶媒の有無に関わらず,自己含有型ジメルの形成を明らかにした.
  • ガス吸収とPXRDにより,相互変換を含む,CO2を含む,またはない7種類のPgC5が特定されました.

結論:

  • ピロガロール[4]のアレンは,様々な固体形態と包装の仕様を示しています.
  • この研究は,ピロガロール[4]アーネスにおけるCO2吸収の最初の証拠を提供している.
  • ピロガロール[4]エレンは,挫折した有機固体の特徴を示し,新しい材料設計の道を開く.