Question

In the presence of water one of the products is shown below: R-Mg-Br + H-OH → RH + HO + Mg2+ + Br Grignard Water Alkane Hydroxide ion Reagent Stronger acid (weaker acid) (weaker base) (stronger pka= 15.7 pka 40-50 base) Q1. If R= Phenyl, what is one of the major products with moist ether? Q2. If R= t-butyl, what is one of the major products with moist ether? At a higher concentration of bromobenzene one of the products is shown below: 2 R-Br + Mg DEE R -R + MgBr2 Q3. If R= Isobutyl, what type of by-products would you expect? Q4. If R= Benzyl, what type of by-products would you expect? In each case (Q1 - 4), only draw the structure of the products.

Answer 1

Ans : Q1) R Phenyl Ph-H & Hoo + Mg2+ + BE Product Qa) R = t-butyl 7H + Hoe + Mg 2+ +BO Q3) RA Isobutyl + Mg Bra I + Mg Bra Q 4) R = Benzyl