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Related Concept Videos

Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene hydroperoxide...
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...
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

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...
NMR Spectroscopy of Benzene Derivatives01:37

NMR Spectroscopy of Benzene Derivatives

Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...
Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
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...

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High-resolution Tandem Mass Spectrometry for Studying Chemical Constituents of Gynura bicolor DC
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Benzophenone C-glucosides from Polygala glomerata Lour.

Chuang-Jun Li1, Dong-Ming Zhang, Shi-Shan Yu

  • 1Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.

Journal of Asian Natural Products Research
|March 19, 2008
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Summary

Four new compounds and one known compound from Polygala glomerata Lour. demonstrated hepatoprotective effects against liver cell damage in a rat model.

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Area of Science:

  • Natural Product Chemistry
  • Pharmacology
  • Hepatology

Background:

  • Polygala glomerata Lour. is a plant source of bioactive compounds.
  • Benzophenone C-glucosides represent a class of natural products with potential therapeutic applications.

Purpose of the Study:

  • To isolate and characterize new benzophenone C-glucosides from Polygala glomerata Lour.
  • To evaluate the hepatoprotective potential of isolated compounds against d-galactosamine-induced liver toxicity.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation through comprehensive spectral data analysis (NMR, MS).
  • In vitro assessment of hepatoprotective activity using WB-F344 rat hepatic epithelial stem-like cells.

Main Results:

  • Four novel benzophenone C-glucosides, glomeratides A-D (1-4), were identified.
  • A known compound, arrilanin G (5), was also isolated.
  • Compounds 1-5 exhibited significant hepatoprotective activity by reducing d-galactosamine-induced toxicity.

Conclusions:

  • Polygala glomerata Lour. is a valuable source of bioactive benzophenone C-glucosides.
  • Glomeratides A-D and arrilanin G possess promising hepatoprotective properties.
  • These findings support the potential therapeutic use of these compounds in managing liver diseases.