The Baylis-Hillman Reaction between Benzaldehyde and Acrylonitrile in the presence of Catalytic amount of DABCO produces corresponding alcohol, which on further treatment with HBr/H₂SO₄ gives corresponding Bromide via SN₁ prime reaction, When the resulting bromide is treated with SMe₂/K₂CO₃and then DEAD, Cycloaddition reaction occurs to give pyrazole ring, In this reaction small amount of H₂O is needed along with acetonitrile, But excess amount of water does not give the product, Why?

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