addition of h2so4 to alkenes

Background:

1.Alkenes(say,ethene) react with concentrated sulphuric acid in the cold to produce alkyl hydrogensulphates.(ethyl hydrogensulphates)

2.If the alkyl hydrogensulphates(ethyl hydrogensulphates) are diluted with water and heated, alcohol can be obtained.(ethanol)

3.Ethanol can be dehydrated to give ethene by heating it with an excess of concentrated sulphuric acid at about 170°C.

My question:

Can alkenes react with hot/warm conc h2so4 in step 1?

Why?

And what are the products if there is a reaction?

1 個解答

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  • 最愛解答

    No.

    It can be interpreted by logic.

    You have known already that alcohol can be dehydrated to give alkene with hot conc. sulphuric acid.

    IF hot conc. sulphuric acid could react with alkene,

    THEN we wouldnt say "alcohol can be dehydrated to give alkene", because even there is alkene given out, it would react with hot conc. sulphuric acid to give some other products else.

    So there is no reaction when alkene is added to warm / hot conc. sulphuric acid

    資料來源: I am a Chemistry teacher of senior form
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