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- Give the product of the following reaction. H₂SO4 H₂O -OH -OSO₂H ? O There is no reaction under these conditions or the correct product is not listed.4. Predict the major product of the following reactions. NBS (a) 0°C Na,Cr,07 H,SO, H,0 (b) он H,SO4 CH,OH (d) heat Br1c) What will be the product of the following reaction? O₂N >> + -Br (HO)₂B- Pd(OAc)₂ Degassed H₂O/Acetone
- Br Brz CH3 CH3 H3C CH2CI2 H3C Br Electrophilic addition of bromine, Br2; to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH,Cl). In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the bromonium ion so that a product with anti stereochemistry is formed. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions Br: :Br: .CH3 H3C H3C CH3 Br:Predict the major product of this reaction. MeO A) I B) II C) III OH D) IV OH || Zn(Hg) IV HCI MeOConsider the reaction scheme below. (i) H3COCHN CO₂Et A H₂N OH EtO OEt B C6H₁1 NO2 base Ha Identify the reagent(s) and conditions A and the intermediate B in this reaction scheme.