addition of h2so4 to alkenes

jadelamlam

Alkenes react with concentrated sulphuric acid in the cold to produce alkyl hydrogensulphates.
If the alkyl hydrogensulphate is diluted with water and heated, alcohol is obtained

My question:
Can alkenes react with hot conc h2so4 directly?Any reaction between them?
What are the products?

Thx a lot

PeetPb

I'm not quite sure but I think that no. Because to produce the alcohol you need concentrated sulfuric acid. However concentrated hot sulfuric acid is also used for elimination of alcohols. So I think that it wouldn't work because you wouldn't either make the alcohol or if you could make one in hot concentrated sulfuric acid it would instantly eliminate back to the alkene. I think that the key is that you have to dilute the acid after the generation of the alcohol.