Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    1
    ReputationRep:
    Hello,

    In past paper mark schemes the reaction conditions for nucleophillic addition reactions using KCN or NaBH4 are 'aqueous and alcoholic'. Can someone briefly explain why this is - is it related to an intermediate?

    Cheers
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by MadeOnTheTrack)
    Hello,

    In past paper mark schemes the reaction conditions for nucleophillic addition reactions using KCN or NaBH4 are 'aqueous and alcoholic'. Can someone briefly explain why this is - is it related to an intermediate?

    Cheers
    To help dissolve both reacting species, the aldehyde and the reagent.
    • Thread Starter
    Offline

    1
    ReputationRep:
    (Original post by charco)
    To help dissolve both reacting species, the aldehyde and the reagent.
    Right, that would make sense. Thanks bud
    Offline

    2
    ReputationRep:
    (Original post by charco)
    To help dissolve both reacting species, the aldehyde and the reagent.
    I understand why it would need to be aqueous but why would it need to be alcoholic?
    • Community Assistant
    • Study Helper
    Offline

    14
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by ayvaak)
    I understand why it would need to be aqueous but why would it need to be alcoholic?
    The reagent is more soluble in an aqueous medium and the aldehyde in a less polar - more covalent medium.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Would you like to hibernate through the winter months?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.