Describe, by using an example, the reaction mechanisms of radical addition polymerisation. Comment on how the...
Consider the preparation of an addition polymer by a radical chain reaction Q. 2 (a) Give the polymers that can be formed from each of the following monomers and show the repeating unit in each case CI OMe (b) Describe the key steps in a radical chain growth polymerisation. What is "head to tail" addition and explain why it preferentially occurs (c) (d) Show the resonance stabilisation for the radical formed where possible for each of the monomers given in...
Mechanisms Question 1 (22 marks) (a) Consider the radical chain reactions of the alkane shown below with Br, in the presence of light. H3C HH H C-CCHS CH3 Br2 hv 2 Different mono- bromo products 25 °C + (you will need to look up the bond dissociation energy (BDE) for the types of bonds formed and broken in this reactions) (i) Give the structures of the products from the reaction and using standard arrow conventions show the series of mechanistic...
Determine the anticipated addition mechanisms for the reactions below. Using correct mechanistic arrows provide the step-by-step mechanism that shows how the following addition reaction proceeds. You do not need to show stereochemistry while providing the mechanism, but show correct stereochemistry in the final product(s).
Cp2Ni undergoes oxidative addition of PhI. How does this reaction happen? Be sure to clearly sketch the product and describe the steps between the reactants and products.
2. The following is a radical chain reaction. Br. heat a. Which product is the major product? (3 pts) b. Show two propagation steps for the formation of the major product. (6 pts) c. Explain, with intermediates, how the major product becomes the major. (6 pts) d. Explain, with TS, how the major product becomes the major. (6 pts)
2.a. Explain Ethics in research 2.b. Using practical examples, describe the ethical principles you will observe conducting research that involves children at the early childhood level of education 4.a. Use practical example to distinguish a cross sectional survey and a longitudinal survey. 4. b. Use practical example to distinguish between an experimental research and a quasi-experimental research DBE431 RESEARCH METHODS IN EDUCATION LEVEL: 300 INSTRUCTIONS: Answer question one (1) and any other two questions 1. Illustrate how you will critically...
13. Which of the following statement is TRUE about reaction mechanisms? A) Curved arrows are not used to describe reaction mechanisms B) In a reaction mechanism a transition state is the same thing as an intermediate C) Each step in a reaction mechanism requires addition of a reagent either by a scientist or a machine at that point in the reaction progress D) For a typical molecule undergoing a reaction, each step in a reaction mechanism occurs very slowly, (on...
Draw the organic product(s) for the following chemical reaction. Underneath each reaction, provide a detailed mechanism(using arrows) of how the product is produced when required. FeCl3 n o + ch Fello Cl2 No Mechanism Polymerization Initiator *Since this is a polymerization, show the polymer using appropriate brackets. No Mechanism. H2O* Mechanism: "The above molecule polymerizes with itself. Show the polymer that is formed Mechanism: (show the formation of the trimer) 2) Draw the organic reactant(s) for the following chemical reaction....
This is an example of a structural formula: Directions: Using structural formulas, diagram the mechanism: Label the type of mechanism by choosing from the following list: 3A. SN1— 3B. SN2 3C. E1 3D. E2 3E. Radical substitution 3F. Acid-base 3G. Addition via carbocation 3H. Addition via onium bridge 3I. Radical addition 3J. Inversion if there's stereochemistry 3K. Racemization of any stereochemistry 3L. Zaitsev major product 3M. Hoffman major product 3N. Anti 3O. Antiperiplanar 3P. Carbocation 3Q. Polar protic solvent 3R....
Question 2 (a) Show how the Wittig reaction might be used to prepare the following alkene. Mechanisms are not required, however your answer should identify what carbonyl component would be used, and show all steps and reagents required to prepare the necessary phosphorus ylide from the appropriate alkyl halide. You should also justify the resultant stereochemistry observed. HH [6 marks] c) wine celor de (b) What product would you expect from the halohydrin reaction shown below? Provide a mechanism for...