Answer Happy

Benzene rings undergo substitution reactions, but not additionreactions. In the lab activity on the preparation of1-methylcyclohexene, your intent would be to verify the presence ofthe alkene by a syn-addition across an alkene using Br2. Inthe paper, see Scheme 2 on page 982, and in particular, the product(3a) of the nucleophilic substitution reaction. Where in thismolecule would you expect a similar Br2 addition reaction to occur?Be specific, and remember while making your predictionthat benzene rings undergo substitution reactions, but notaddition reactions.
OH Lot Lov or MeO 1a carbocation (I) H* elimination K₁ acid MeO 2a nudeophilic substitution K₂ 3a In the absence of PPh3, K₁ K₂, 3a is the major product. In the presence of PPh3, K₁ > K₂, 2a is the major product. Scheme 2. Possible reasons behind the effect of PPh on the AICI, catalyst. 2a Me O OMe