Write the mechanism of Paterno-Buechi reaction.
Mechanism of the Paterno-Buechi Reaction
The possible transitions (C=O) are shown below:
Once the carbonyl ground state has been photoexcited, either
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Reaction of primary amine, in presence of an acid, with carbonyl compound
gives an imine. The rate of reaction increases by an increase in acidity but
beyond a certain limit, the rate decreases with further increase of acidity.
Draw and explain potential energy diagram for the reaction of addition of HCl to 1, 3- butadiene at a low and high temperatures.
Taking suitable examples, discuss the migrating aptitude of the migrating group in
Pinacol-pinacolone rearrangement reactions.
How would you prepare cis and trans alkene from alkyne? Give its mechanism.
In the following pairs which of the carbocation is more stable and why?
i) NC – CH – CH2 +CH2 CH3 or NC - CH2 - +CH2 H2
sec. carbocation p – carbocation
ii) CH3 CH2 +CH - CH2 CH2 CH3 or CH3 (CH2)4 +CH2
sec. carbocation p – carbocation
Arrange the following in the increasing order of electrophilic substitution. Justify your answer.
Write the mechanism of following rearrangement reactions
i) Wagner-Meerwein rearrangement
ii) Curtius rearrangement