Organic II - Conjugation Systems (Chp 15) Flashcards
When does conjugation occur?
Whenever p orbitals can overlap on 3 or more adjacent atoms.
Conjugated double bonds are separated by a _________ bond.
single
Isolated double bonds are separated by ________________ bonds.
2 or more single
Conjugated double bonds are _____ stable than other bonds.
more
Conjugated double bonds have extra ______.
stability
The more stable the compound, the less heat released during _____________.
hydrogenation
How many lobes does each p orbital have with the wave function?
2 lobes
How many p orbitals does 1,2-dibutene have?
4 p orbitals (atomic orbitals)
When lobes overlap constructively, what is formed?
A pi bonding (p) MO is formed
Even number of MOs leads to an…
even number of bonding and antibonding MOs.
The number of atomic orbitals equals…
the number of molecular orbitals (MO).
Odd number of MOs means there are…
bonding, antibonding and a bonding MO.
The maximum number of nodes equals…
n-1 (n = number of atomic orbitals)
What creates nodes?
Antibonding
Which is more stable, s-trans or s-cis? Why?
s-trans b/c it has no interference b/w protons.
Describe an allylic carbon.
The carbon directly attached to an sp2 carbon (double bonded carbon).
Which is more stable? s-trans or s-cis?
s-trans