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Physical Properties of Amines

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.

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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

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A new 9,10-dihydrophenanthrene from Dendrobium moniliforme.

Ningdong Zhao^1,2, Guangyu Yang³, Yan Zhang⁴

¹a School of Chemistry and Chemical Engineering, Yunnan Normal University , Kunming 650500 , P.R. China.

Natural Product Research

|July 2, 2015

Summary

A new dihydrophenanthrene derivative was identified from Dendrobium moniliforme. This study details the isolation and identification of 25 compounds, including novel and previously reported natural products from this plant species.

Keywords:

9,10-dihydrophenanthrene Dendrobium moniliforme Orchidaceae

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Area of Science:

Natural Product Chemistry
Phytochemistry
Organic Chemistry

Background:

Dendrobium moniliforme is a traditional medicinal plant with a rich history of use.
The chemical constituents of D. moniliforme are diverse and possess various biological activities.
Further investigation is needed to fully characterize its phytochemical profile.

Purpose of the Study:

To isolate and identify chemical constituents from the whole plants of Dendrobium moniliforme.
To report new compounds and known compounds from this species.
To contribute to the understanding of the phytochemical diversity of the Dendrobium genus.

Main Methods:

Phytochemical investigation involving extraction and isolation techniques.
Spectroscopic methods (e.g., NMR, MS) for structure elucidation.
Comparison with existing literature for compound identification.

Main Results:

A new 9,10-dihydrophenanthrene derivative, 1,5-dihydroxy-3,4,7-trimethoxy-9,10-dihydrophenanthrene, was isolated and identified.
Twenty-four known compounds were also identified, including hircinol, diospyrosin, moscatilin, gigantol, and various bibenzyl derivatives.
Six compounds (3, 4, 13, 16, 17, 20) were reported from the Dendrobium genus for the first time.

Conclusions:

The phytochemical analysis of Dendrobium moniliforme yielded a novel dihydrophenanthrene and numerous known compounds.
This study expands the knowledge of the chemical diversity within the Dendrobium genus.
The identified compounds may hold potential for further pharmacological research.