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Dienes are alkenes with 2 double bonds. IUPAC: Same as alkene, but change -ene to -adiene and use two numbers to locate the two double bonds (number from the end of the chain which makes the smaller of these numbers smaller). Compounds containing two carbon-carbon cumulated double bonds are called allenes.
In this regard, can alkenes have more than one double bond?
Alkenes with more than one double bond. In alkenes with more than one double bond, the suffix -ane in the corresponding alkane parent name is replaced with the suffix -adiene if there are two double bonds, and -atriene if there are three double bonds.
- Both these compounds have double bonds, making them alkenes.
- The double bond in example (3) is located in the center of a six-carbon chain.
- These examples include rings of carbon atoms as well as some carbon-carbon triple bonds.
In this manner, why double bonds are present in alkene?
This is because in a single bond only 2 electron bonding occurs but the bonding needs to take place for 4 electrons. Hence double bonds are formed making them belong to a group called Alkenes.
If more than one double bond is present, indicate their position by using the number of the first carbon of each double bond and use the suffix -diene (for 2 double bonds), -triene (for 3 double bonds), -tetraene (for 4 double bonds), etc. 6. a. Cycloalkenes are named in a similar way.