(a) In the absence of peroxides, isopropyl alcohol and styrene do not react. But when eroxides are present, an addition reaction occurs as shown below. Homolytic BDE values for rtain bonds in the reactants and products are shown in kcal/mol. 88 OH H H 103 A: 60 RO-OR H 101 94 H all sp' C-H's: -112 raw out the radical chain reaction mechanism, including the two-step initiation. After drawing e mechanism, calculate AH and Ea for each propagation step individually, and then for the action overall. Predict two very minor by-products formed by chain termination.

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2. (a) In the absence of peroxides, isopropyl alcohol and styrene do not react. But when
peroxides are present, an addition reaction occurs as shown below. Homolytic BDE values for
certain bonds in the reactants and products are shown in kcal/mol.
H103
88
OH H
A: -60
RO-OR
101
94 H
82
all sp' C-H's: -112
Draw out the radical chain reaction mechanism, including the two-step initiation. After drawing
the mechanism, calculate AH and Ea for each propagation step individually, and then for the
reaction overall. Predict two very minor by-products formed by chain termination.
(b) The relative concentration of the two reactants drastically affects the success of this reaction.
Which reactant would be preferred in excess, and why? What happens if the wrong reactant is in
excess?
Transcribed Image Text:2. (a) In the absence of peroxides, isopropyl alcohol and styrene do not react. But when peroxides are present, an addition reaction occurs as shown below. Homolytic BDE values for certain bonds in the reactants and products are shown in kcal/mol. H103 88 OH H A: -60 RO-OR 101 94 H 82 all sp' C-H's: -112 Draw out the radical chain reaction mechanism, including the two-step initiation. After drawing the mechanism, calculate AH and Ea for each propagation step individually, and then for the reaction overall. Predict two very minor by-products formed by chain termination. (b) The relative concentration of the two reactants drastically affects the success of this reaction. Which reactant would be preferred in excess, and why? What happens if the wrong reactant is in excess?
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