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.
