Some Applications of Spectrophotometry to the Analysis of Natural Products

Scott, A. I.

doi:10.1016/b978-0-08-013615-8.50012-1

Interpretation of the Ultraviolet Spectra of Natural Products 1964

DOI: 10.1016/b978-0-08-013615-8.50012-1

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Some Applications of Spectrophotometry to the Analysis of Natural Products

A. I. Scott

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2012

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Cited by 2 publications

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A New Prenylated Acetophenone from the Root Bark of Derris indica

Edayadulla

Ramesh

2012

Natural Product Communications

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A new acetophenone, 1-[2,4-dihydroxy-5-(3-methylbut-2-enyl)phenyl]ethanone (1) was isolated from the root bark of Derris indica, along with 3,7,dimethoxy-3',4'-methylenedioxyflavone (desmethoxykanugin) (2), 5-methoxyfurano[4",5":6,7]flavone (pinnatin) (3), and 3'-hydroxyfurano[4",5":7,8]flavone (pongol) (4). The structures of these compounds were established by means of chemical and spectral studies. The occurrence of this prenylated acetophenone in D. indica is of biogenetic and chemotaxonomic significance.

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A New Prenylated Acetophenone from the Root Bark of Derris indica

Edayadulla

Ramesh

2012

Natural Product Communications

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Kinetic Study and Degradation Mechanism of Landrin in Aqueous Media

Ouertani

Latrous

Hamida

2012

Progress in Reaction Kinetics and Mechanism

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The alkaline hydrolysis of landrin (2,3,5-trimethylphenyl-N-methylcarbamate) into 2,3,5-trimethylphenol was examined for various buffers and sodium hydroxide solutions ranging from pH 11.8 to 13.6. This work was carried out by reversed phase liquid chromatography and UV spectrophotometry. The positive activation entropy DS 6 ¼ ¼ þ38:40 J mol À 1 K À 1 and the absence of general basic catalysis indicated an E1cB hydrolytic mechanism involving the formation of methyl isocyanate. This result was confirmed by the finding that landrin fits well into Brönsted and Hammett plots, obtained for a series of substituted Nmethylcarbamates whose decomposition in aqueous media was established to follow an E1cB mechanism.

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Some Applications of Spectrophotometry to the Analysis of Natural Products

Cited by 2 publications

References 160 publications

A New Prenylated Acetophenone from the Root Bark of Derris indica

A New Prenylated Acetophenone from the Root Bark of Derris indica

Kinetic Study and Degradation Mechanism of Landrin in Aqueous Media

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