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When two hydrogens of an unsubstituted alkene are replaced with two alkyl groups, the alkene is disubstituted They can only be cis. The two alkyl groups can be on the same side or the opposite
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Similarly, replacing three and four hydrogens of an unsubstituted alkene gives tri and tetrasubstituted alkene. Cycloalkanes are small rings (less than or = to 7 members) Tetrasub (4 r groups) 2
Unsubstituted (all h's) *more stable = less energy click the card to.
A trisubstituted alkene is an alkene in the molecule of which the doubly bonded carbons are bonded to a total of three carbon atoms excluding each other See also monosubstituted alkene, disubstituted alkene, tetrasubstituted alkene. Since the same bonds are formed and broken in every hydrogenation reaction, the heat of hydrogenation is measuring the stability of each type of alkene This means that the lower the heat of hydrogenation, the greater the stability of the alkene.
There are 3 factors that influence alkene stability How many alkyl groups are attached to the c=c When we tell students about the formation of alkenes (by elimination for example), we often tell them that reactions will favour the thermodynamically favourable most substituted alkene Zaistev's rule empirically described this:
Increases with increasing substitution (unsub
There are two factors which affect the stability order First, the presence of alkyl groups directly attached to the double bond tends to stabilize the system However, they differ in terms of the number of substituents attached to the carbon atoms participating in the double bond. Cis disub is less stable than trans
