Aromatic compounds play key roles in the biochemistry of all living things. The four aromatic amino acids histidine, phenylalanine, tryptophan, and tyrosine each serve as one of the 20 basic building-blocks of proteins. Further, all 5 nucleotides (adenine, thymine, cytosine, guanine, and uracil) that make up the sequence of the genetic code in DNA and RNA are aromatic purines or pyrimidines. The molecule heme contains an aromatic system with 22 π electrons. Chlorophyll also has a similar aromatic system.
Aromatic compounds are important in industry. Key aromatic hydrocarbons of commercial interest are benzene, toluene, ortho-xylene and para-xylene. About 35 million tonnes are produced worldwide every year. They are extracted from complex mixtures obtained by the refining of oil or by distillation of coal tar, and are used to produce a range of important chemicals and polymers, including styrene, phenol, aniline, polyester and nylon
Principal characteristics of aromatic hydrocarbons are:- the contain benzenic rings- frequently they have an agreeable odor- they burn with soot; this is a disadvantage- the ratio carbon/hydrogen is great
For example aromatic hydrocarbons.
the longest chain of carbons
Coal
Aromatic hydrocarbons like toluene, ketones, paraffins, chlorinated hydrocarbons and turpentine.
Principal characteristics of aromatic hydrocarbons are:- the contain benzenic rings- frequently they have an agreeable odor- they burn with soot; this is a disadvantage- the ratio carbon/hydrogen is great
A. W. Pucknat has written: 'Health impacts of polynuclear aromatic hydrocarbons' -- subject(s): Adverse effects, Air, Air Pollutants, Environmental aspects, Environmental aspects of Polycyclic aromatic hydrocarbons, Pollution, Polycyclic Hydrocarbons, Polycyclic aromatic hydrocarbons, Toxicology
Aromatic hydrocarbons contain one or more carbon cycles.
This was the chemist August Kekule.
Leticia Pizzul has written: 'Degradation of polycyclic aromatic hydrocarbons by actinomycetes' -- subject(s): Biodegradation, Polycyclic aromatic hydrocarbons, Actinomycetales
Alternating single and double bonds
For example aromatic hydrocarbons.
Phenol is toxic and corrosive.
Hydrocarbons which contain a benzene ring (google that yourself)
Alkanes, alkenes, alkynes, and aromatic hydrocarbons
Willem Karel de Raat has written: 'Mutagens and polycyclic aromatic hydrocarbons in ambient airborne particles' -- subject(s): Air, Environmental aspects, Environmental aspects of Mutagens, Environmental aspects of Polycyclic aromatic hydrocarbons, Health aspects, Mutagens, Pollution, Polycyclic aromatic hydrocarbons
Principal characteristics of aromatic hydrocarbons are:- the contain benzenic rings- frequently they have an agreeable odor- they burn with soot; this is a disadvantage- the ratio carbon/hydrogen is great