CCkaksoissidokset

CCkaksoissidokset is a Finnish term that translates to "carbon-carbon double bonds." In chemistry, a carbon-carbon double bond is a covalent chemical bond between two carbon atoms involving four shared electrons, in contrast to a single bond which involves two shared electrons. This type of bond is found in organic chemistry, particularly in a class of compounds called alkenes.

The presence of a carbon-carbon double bond significantly influences the chemical and physical properties of a molecule. It is a region of higher electron density, making it more reactive than a carbon-carbon single bond. Alkenes undergo addition reactions where the pi bond (one of the two bonds in the double bond) breaks, and atoms are added to the carbon atoms. Examples of such reactions include hydrogenation, halogenation, and hydrohalogenation.

The geometry around a carbon-carbon double bond is trigonal planar, with bond angles of approximately 120 degrees. This restricted rotation around the double bond can lead to geometric isomerism, specifically cis-trans isomerism, in molecules with substituents on both carbon atoms of the double bond. These isomers have different physical properties such as melting and boiling points. CCkaksoissidokset are fundamental building blocks in many organic molecules, including natural products, polymers, and pharmaceuticals.