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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.
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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...
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Anxiolytic Drugs: Benzodiazepines and Buspirone

Benzodiazepines are a class of anxiolytic drugs known for their rapid efficacy and high therapeutic-to-lethal dose ratio, but with a potential risk of drug dependence. These drugs are lipophilic, allowing for rapid absorption after oral administration, eventually reaching the central nervous system (CNS). Once in the CNS, benzodiazepines bind to the allosteric site of the GABAA receptor. This binding enhances the inhibitory effects of the neurotransmitter GABA. By doing so, they prevent...
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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...
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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...
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Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...

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High-resolution Tandem Mass Spectrometry for Studying Chemical Constituents of Gynura bicolor DC
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Benzophenone O-glycosides from Hypericum elegans.

Paraskev T Nedialkov1, Dimitrina Zheleva-Dimitrova, Ulrich Girreser

  • 1Department of Pharmacognosy, Faculty of Pharmacy, Medical University of Sofia, Sofia, Bulgaria. pnedialkov@gmail.com

Natural Product Research
|September 5, 2009
PubMed
Summary

Researchers isolated a new benzophenone O-rhamnoside, elegaphenonoside, and two known glycosides from Hypericum elegans. This study details the structure of elegaphenonoside and identifies other plant compounds, contributing to phytochemistry knowledge.

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Area of Science:

  • Phytochemistry
  • Natural Product Chemistry
  • Organic Chemistry

Background:

  • Hypericum species are known sources of diverse bioactive compounds.
  • Benzophenone glycosides represent an important class of natural products with potential pharmacological activities.
  • The chemical composition of Hypericum elegans has not been extensively studied.

Purpose of the Study:

  • To isolate and characterize new and known compounds from the aerial parts of Hypericum elegans.
  • To elucidate the chemical structure of the novel benzophenone O-rhamnoside, elegaphenonoside.
  • To identify other secondary metabolites present in the plant extract.

Main Methods:

  • Extraction and isolation of compounds using chromatographic techniques (e.g., column chromatography, HPLC).
  • Structure elucidation of the new compound using spectroscopic methods (e.g., NMR, Mass Spectrometry) and chemical analysis.
  • Identification of known compounds through comparison with authentic samples and literature data.

Main Results:

  • Elegaphenonoside, a new benzophenone O-rhamnoside, was isolated and its structure determined as 3',5',6-trihydroxy-4-methoxybenzophenone-2-O-alpha-L-rhamnopyranoside.
  • Two known benzophenone O-glycosides, hypericophenonoside and neoannulatophenonoside, were also identified.
  • Additionally, the presence of kaempferol, quercetin, isoquercitrin, norathyriol, I-3,II-8-biapigenin, quercitrin, hyperoside, and rutin was confirmed.

Conclusions:

  • The study successfully identified a novel benzophenone O-rhamnoside, elegaphenonoside, from Hypericum elegans.
  • The findings expand the knowledge of the phytochemical profile of Hypericum elegans, highlighting its rich content of glycosides and flavonoids.
  • This research contributes valuable data to the field of natural product chemistry and provides a basis for further investigation into the biological activities of these compounds.