Chapter 3, Problem 93EQ

Define the Mechanism of the Radical Addition of HBr to an Alkene ?

Predict the major products formed when 2- methyl-1-butene reacts with: HCl. Show the reaction mechanism the given alkene reactions

Following is an equation for iodination of toluene. This reaction does not take place. All that happens under experimental conditions for the formation of radicals is initiation to form iodine radicals, I , followed by termination to reform I2. How do you account for these observations?

Following is a balanced equation for the allylic bromination of propene. CH2==CHCH3 + Br2 h CH2==CHCH2Br + HBr (a) Calculate the heat of reaction, H 0, for this conversion. (b) Propose a pair of chain propagation steps and show that they add up to the observed stoichiometry. (c) Calculate the H 0 for each chain propagation step and show that they add up to the observed H 0 for the overall reaction.

4. The following reaction scheme shows the radical polymerization of styrene to make polystyrene. a) Add electron-pushing arrows to show the mechanisms of steps 1-3. Determine if these are initiation, propagation, or termination steps. b) Radical polymerization is often performed in the absence of O2 because the oxygen radical can couple with the polymer radical to terminate polymerization. Propose electron-pushing arrows for step 4 and predict the product of that step.

Acid-catalyzed water removal reaction of neopentyl alcohol, (CH3) 3CCH2OH, produces 2-methyl-2-butene as the main product. Design a mechanism that shows all the steps in the formation of this product.

Predict the major products formed when 2- methyl-1-butene reacts with: Cl2. Show the reaction mechanism the given alkene reactions

Give the reaction mechanism showing all possible products for the following reactions: (a) Reaction of 1-propene with hydrogen bromide, HBr (g)

Consider the compound 3(S),5,5-trimethyl cyclohexane. Upon reduction with H2 on a 1% Pt/C catalyst, draw the equation for this reaction, find out the absolute configuration of the product and explain why the absolute configuration is completely inverted in this reaction