Petroleum Hydrocarbon Compounds; Series 3
Cyclic has to do with circular or ring-like arrangement.
A cyclic chemical compound is one that its molecules are structured from rings of atoms.
water molecule is not cyclic. It has a linear arrangement where
two hydrogen atoms hold hands with one oxygen atom, like this:
The sulfur dioxide molecule is another example of linear arrangement where two oxygens are holding hands with one sulfur
the organic universe of compounds, in the subset class of hydrocarbon
compounds, we have the group of petroleum hydrocarbon compounds. There
we find a cross-like molecular arrangement of the very basic compound
We climb up the ladder of complexity to the caterpillar-like molecule of heptane;
and proceed from there to the royal-like multi-name line, like the one below.
we get more complex; and petroleum with its over 500 different
molecules can get quite interesting; we enter the ring-like fellowship
of the cyclic compounds.
The simplest ring of the petroleum gang is benzene; six carbons dancing holding hands and hydrogen toddlers holding to each of the dancers.
The rings evolve to intricate bonds; like the case of ethylbenzene where the ethyl kitty is springing out of the benzene ring.
In the universe of organic compounds, a cyclic compound is one in which a series of carbon atoms are connected together to form a loop or ring. Benzene is a well known example.
Hetero means other or different. A heterocyclic compound
would be the case where atoms other than carbon enter into the ring;
the molecule is built of a ring of atoms of more than one kind.
The ring-like molecule diagrammed below is heterocyclic; nitrogen entered into the carbon ring.
is an atom other than carbon in the ring of a heterocyclic
compound. In the above ring, the nitrogen is designated that
status; the nitrogen is a heteroatom.
and petroleum products are very complex mixtures that contain primarily
hydrocarbons (compounds containing molecules of carbon and hydrogen
atoms), heteroatom compounds (compounds containing molecules of carbon
and hydrogen atoms with heteroatoms such as sulfur, nitrogen, or
oxygen), and relatively small concentrations of metallic constituents.
complexity of petroleum and petroleum products increases with carbon
number. The heavier the material, the larger the number of possible
combinations of atoms.
Acknowledgment: The Association for Environmental Health and Sciences; http://www.aehs.com/publications/catalog/contents/tph.htm