Dieny

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Diene - a group of organic compounds, unsaturated hydrocarbons, in which there are two double bonds between carbon atoms. The general pattern of open-chain dienes is CnH2n-2, while cyclic dienes are CnH2n-4.

Depending on the number of single bonds between the double bonds in the carbon chain, three types of dienes are distinguished: cumulative called allenes, in which the double bonds are adjacent to each other: ...- CH = C = CH- ..., which causes them to be unstable and slowly convert to the corresponding alkanes: ... CH = C = CH- ... ...- CH2-C≡C -...

The simplest cumulative dividend is 1,2-butadiene. conjugated The simplest conjugated diene is 1,3-butadiene: Shoe-1,3-diene Double bonds occurring close together, due to chemical resonance, are relocated. As a result, conjugated dienes are more reactive than simple alkenes and less reactive from allenes. Diene conjugates with simple alkene are involved in Diels-Alder reactions and metathesis reactions. isolated (-CH = CH-CH2 -...- CH = CH-) in which the double bonds are separated by more than one single bond, because of the small interactions of these bonds are similar to the properties of simple alkenes. The simplest diene isolated is 1,4-pentadiene. Cyklodieny

Analogous cyclic hydrocarbons containing two double bonds are called cyclodienes. Some cyclodins have properties similar to chain dienes (eg cycloocta-1,4-diene), others have aromatic characteristics (eg cyclopentadienyl ligand, ie cyclopenta-1,3-diene after attaching one electron).



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