10.15An electrophile is by defnition an electron-seeker.When an electrophile attacks ethylene, it inter-acts with the porbital because this is the orbital that contains electrons. The p* orbital of ethylene isunoccupied.10.16Analyze the reaction of two butadiene molecules by the Woodward–Hoffmann rules by examiningthe symmetry properties of the highest occupied molecular orbital (HOMO) of one diene and thelowest unoccupied molecular orbital (LUMO) of the other.This reaction is forbidden by the Woodward–Hoffmann rules. Both interactions involving the endsof the dienes need to be bonding for concerted cycloaddition to take place. Here, one is bonding andthe other is antibonding.10.17Dienes and trienes are named according to the IUPAC convention by replacing the -
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