The pair of reactions depicted below are

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CSIR-UGC (NET) Chemical Science: Held on (18 Sept 2022)
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  1. enantioselective reactions
  2. diastereospecific reactions
  3. diastereoselective reactions
  4. enantiospecific reactions

Answer (Detailed Solution Below)

Option 2 : diastereospecific reactions
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Concept:-

Stereospecific reaction:

  • A reaction in which the stereochemistry of the reactants controls the outcome of the reaction.
  • In general, one stereoisomer of a certain reactant produces one stereoisomer of a certain product, whereas a different stereoisomer of the same reactant produces a different stereoisomer of the same product.
  • An example of a stereospecific reaction is

 

Stereoselective reaction:

  • A stereoselective reaction occurs when more than one reaction occurs between a set of reactants under the same conditions, resulting in stereoisomers that result in greater amounts of one product than the others.
  • Enantioselective reactions produce only enantiomers and are therefore stereoselective.
  • An example of a stereoselective reaction is

Explanation:-

The product formed in the reaction are A and B respectively.

  • The mirror image of compound A is compound C and if compound C is rotated through 180o (in plane) it gives compound D.
  • Compound D and compound B does not has any mirror image relationship.
  • Thus, this two reactions are examples of diastereospecific reactions.

​Conclusion:-

Hence, the pair of reactions depicted below are diastereospecific reactions.

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