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This double bond is located between the fourth and fifth carbon atoms of the 18-carbon sphingoid base.
Note the addition of a restraining olefin (double bond) bridge in (g).
It is initiated by free-radical attack upon a lipid, resulting in the removal of a hydrogen atom from a methylene group adjacent to a double bond.
Saturated cyclic compounds contain single bonds only, whereas aromatic rings have an alternating (or conjugated) double bond.
This compound features a rare example of a stable, unhindered carbon-selenium double bond.
They have a long and flexible chain between the onium heads, except for the double bond of mivacurium.
Each contains one double bond within its molecular structure.
The compound is deprotonated on one side and protonated on another side, whereas a single bond and a double bond are exchanged.
Each double bond has two additional localized electrons, while each triple bond has four additional electrons (two pairs) between the bonded atoms.
Oxidation at the double bond occurs slowly in air, and is known as rancidification in foodstuffs or drying in coatings.
The overall transformation is the conversion of the carbonsulfur bonds to a carboncarbon double bond.
Due to the nature of elimination, it can be applied to both small rings, and large rings containing a double bond.
The aldehydic carbon-oxygen double bond can also be subject to hydroformylation, which leads to formic acid and its esters.
These materials exist as "cis" or "trans" isomers depending on the geometry of the double bond.
Alkenes with a thiol group on both sides of the double bond are called enedithiols.
