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- Use bond-dissociation enthalpies (Table 4-2, p. 167) to calculate values of ∆H° for the following reactions. (a) CH3¬CH3 + I2 ¡ CH3CH2I + HI(b) CH3CH2Cl + HI ¡ CH3CH2I + HCl(c) (CH3)3C¬OH + HCl ¡ (CH3)3C¬Cl + H2O (d) CH3CH2CH3 + H2 ¡ CH3CH3 + CH4 (e) CH3CH2OH + HBr ¡ CH3CH2¬Br + H2O2) Predict the major product for each Diels-Alder reaction. Include stereochemistry where appropriate. H. C=N (a) H H. CH3 CH;O, (b) Ph (c) Ph3. The following reactions are not technically the Diels-Alder reaction, but you should still be able to predict the product (with appropriate regio/stereochemistry). (a) (b) OMe OMe H3C N + NC H3C. CN CH3
- 8) Predict the two products that form in following Diels-Alder reaction Circle the major product. CH₂O CH₂OCH, H O₂NDraw curved arrows and identify the thermal and photochemical products of the electrocyclic reaction of (2Z,4Z,6E)-octa-2,4,6-triene. Step 2: An electrocyclic reaction will undergo a concerted electron shift to form a cyclic ring. A new sigma bond will be formed between carbons 2 and 7. The product will be neutral. (2ZAZ,6E)-octa-2,4,6-triene Draw the curved arrows to show the mechanism. Select Draw Rings More Erase4-44 Draw the important resonance forms of the following free radicals. (a) CH₂=CH-CH₂ (b) (d) (e) -CH₂ (c) (f) CH₂-C-0.
- 1) a until g(3) HI does not undergo free radical addition with 1-butene, even in the presence of a peroxide. Please provide an explanation by analyzing the propagation steps if the same radical reaction occurred with HI. Besides the bond dissociation enthalpies in the appendix, the following approximate bond dissociate enthalpies might be useful to you: ~310 kJ/mol The component of C=C CH3CH₂CH₂CH₂-Br CH3CH₂CH₂CH2-I -290 kJ/mol (C-Br bond) ~235 kJ/mol (C-I bond)Identify the diene and dienophile expected to produce the Diels-Alder product shown in the box below. SO 11 SO IV ον O. IV 4 ||| ||| ||
- What were the starting materials for each of the following Diels-Alder reaction products? (a) (d) (g) COOH COOH O COOH (e) COOH (b) D CN +En CN CN CN (h) (†) (c) CHO CHO I9. (a) With the help of orbital correlation diagram predict the conditions of 4+2r system. (b) Using PMO approach, discuss the reaction conditions for 4x electrocyclic reaction. (c) What are 1,3-dipolar cycloaddition reactions? Give examples. 10. Predict the product under the given reaction conditions and propose mechanism. C (b) A OMe O OMe OMe A in Decane(c) In the Diels-Alder reactions below, explain the product that could be formed. A H (ii) A `OCH3