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Heterocyclic compounds (1)

1 Heterocyclic compounds (1)ByDr. GhassanQaisAliHeterocyclic compounds2 Introduction:Studentswillbefamiliarwithc arbocycliccompounds,suchascyclohexaneand benzene, , , ,sulfurornitrogen,butmanyotherelementsca nfunctioninthisway,includingboron, , ,manyheterocyclesretainthesenames;aselec tionofcommonfive-andsix-memberedheterocy clesthatcontainoneoxygen, Cycliccompoundshavingasringmembersatomso fatleasttwodifferentelements, ,1,2-thiazole. Any of a class of organic compounds whose molecules contain one or more rings of atoms with at least one atom (the heteroatom) being an element other than carbon, most frequently oxygen, nitrogen, or ,nucleicacids,thechemicalsubstancesthatc arrythegeneticinformationcontrollinginhe ritance,consistoflongchainsofheterocycli cunitsheldtogether)DNAiscomposedofhetero cyclicbases-pyrimidinesandpurines(.Manyn aturallyoccurringpigments,vitamins, ,bothsyntheticandnatural, ,fungicides,herbicides, ,developers,antioxidants, derivatives and classification Heterocyclic derivatives as a group, can be divided into two broad areas:aromatic and non-aromatic.

Heterocyclic compounds include many of the biochemical material essential to life. For example, nucleic acids, the chemical substances that carry the genetic information controlling inheritance, consist of long chains of heterocyclic units held together)DNA is composed of heterocyclic bases-pyrimidines and purines(.

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