Taking suitable examples, discuss the migrating aptitude of the migrating group in
Pinacol-pinacolone rearrangement reactions.
In the pinacol rearrangement, a 1,2-diol is treated with acid and rearranges to a carbonyl compound in the following manner :
migratory aptitude of groups in pinacol-pinacolone rearrangement is:
H>Ph>Me3C>MeCH2>Me
The reason this kind of migration occurs are:-
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Write the main product of the following reactions giving reasons for your answer.
How would you prepare cis and trans alkene from alkyne? Give its mechanism.
Write the full reaction and mark the nucleophile and electrophile in each case.
i) Reaction between potassium cyanide and 1-chloropropane
ii) Reaction between hydrogen bromide and cis 2-butene
iii) Reaction between sodium methoxide and benzyl bromide
iv) Acid catalysed reaction of water with cyclopentene
v) Reaction between ethanal and hydrogen cyanide
Electron withdrawing substituents at carbonyl carbon increase its
reactivity towards nucleophilic addition reactions.
How free radicals are generated using redox reaction? Give at least two examples.
What are the major advantages of such reactions?
In Wittig reaction, the methyl, primary and secondary alkyl halide can be used to
prepare Wittig reagent (ylide) but not tertiary alkyl halide.
Aromatic aldehydes are less reactive than aliphatic aldehyde.