Polycyclic and Heterocyclic Aromatic Compounds

Polycyclic aromatic are hydrocarbons that are composed of multiple aromatic rings. An aromatic ring is an organic ring in which the electrons are delocalized. The simplest such chemicals are naphthalene, having two aromatic rings, and the three-ring compounds anthracene and phenanthrene. A heterocycle is a cyclic compound that contains a heteroatom in the ring. A heteroatom is any atom other than carbon that is present in the ring structure, such as nitrogen, oxygen or sulfur. About two-thirds of organic compounds belong to this class, and they number among them some of the most significant compounds for human beings.

 

 

Heterocycle Examples

 

Greek letters are used to describe the carbon atom position which is situated the closest to heteroatom. Alpha (α) would represent the closest, while for the further ones it would be beta (β) and gamma (γ) respectively. Some examples of heterocycles are haemoglobin, bilirubin and porphyrins.

 

References

1) Bruce Alberts, A. J. (2007). Molecular Biology of the Cell.

2) Van Holde KE, M. C. (1996). Biochemistry. Menlo Park, California: Benjamin/Cummings Pub. Co., Inc.

3) NV, B. (2002). Medical Biochemistry. San Diego: Harcourt/Academic Press.

4) Suman Khowala, D. V. (2008, June 4). Biomolecules: (introduction, structure & function) . Retrieved from http://nsdl.niscair.res.in/jspui/bitstream/123456789/802/1/Carbohydrates.pdf

5) H. M. Asif, M. A. (2011, January 21). Carbohydrates. Retrieved from International Research Journal of Biochemistry and Bioinformatics: http://www.interesjournals.org/full-articles/carbohydrates.pdf?view=inline

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