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Carbon-carbon double bond
From Wikipedia, the free encyclopedia
A carbon to carbon double bond is a bond between two carbon atoms. This bond consists of the sigma bond and one pi bond. A carbon-carbon double bond is shorter and stronger than that of its single counterpart. It is denoted by two lines connecting carbon molecules together, thus: C=C . This is called an un-saturated molecule.
The presence of a double bond in a molecule can be determined by adding a solution of Bromine in water to the suspect compound. If the bromine water loses its red-brown colour and becomes colourless then an unsaturated compound is present. This is not conclusive evidence for the presence of a double bond but is an indication that further investigation may be required.
The high electron density arrount a carbon carbon double bond leads to a high suseptability to Electrophilic Attack.
This bond is the main component of the alkene functional group. Carbon to carbon double bonds can often form part of a resonance structure with other atoms in a molecule, such as that in the benzene ring.
The geometric arrangement of atoms around a carbon-carbon double bond (C=C bond) is bent; in that there are two carbon atoms, this geometric arrangement is sometimes called double- or dual- bent. This arrangement can be seen in the diagram of ethene: http://chemistry.guide.ac/thumbs/ethene.jpg
The ridgid nature of the C=C double bond results in a type of isomerism see Cis-trans isomerism.
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