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- (a) Complete the following sequence of reactions (i.e., give the structure for compounds A and B), giving structural details of all key intermediates. heat & A COOCH3 H₁₂ Ni (b) Provide the bond line structures for the pair of compounds used for the Diels-Alder synthesis of the compound shown below. O B COOCH3 (c) Draw the two major products obtained when (3E,5Z)-2,2,3,6,7-pentamethylocta-3,5-diene reacts with HBr at low and high temperatures. Label the products as the kinetic or thermodynamic product AND, if applicable, use dashes and wedges to show the correct stereochemistry in the obtained products.| Anthracene readily undergoes a Diels-Alder reaction with tetracyanoethene, even though anthracene is NC CN ? + aromatic. NC CN (a) Draw two possible products that can form from this reaction. (b) Explain why anthracene can readily undergo a Diels-Alder reaction, whereas benzene does not.) 1) Provide the structure of the major product, which results from Diels-Alder reaction. Draw the structure of the MOST stable product that results when the diene shown is treated with HBr at 80°C. HBr 80 °C CH3 Diels-Alder Reaction Provide the structure of the major organic product in the following reaction. XO
- 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 IElectrophilic aromatic substitution usually occurs at the 1-position of naphthalene, also called the a position. Predict the major products of the reactions of naphthalene with HNO3, H2SO4.Electrophilic aromatic substitution usually occurs at the 1-position of naphthalene, also called the a position. Predict themajor products of the reactions of naphthalene with the following reagents.(a) HNO3, H2SO4
- 4. Propose a synthesis plan for these molecules (a) (b) Br. OEt from a Wittig reaction from benzene i) Propose a Diels-Alder reaction for the molecule to the left or ii) Draw the mechanism for 3f: (ix)→ (x) CI- CIQ4. Discuss the reagents, conditions, and mechanism of the following reactions. a) Kolbe Reaction b) Williamson synthesis c) Reimer Tiemann reactionCyclopentadienyl anion (shown) has the following characteristic. O it is an anion with six π electrons, meeting the Hückel rule for aromaticity O it is not aromatic because it has only four electrons and the tetrahedral carbon prevents cyclic conjugation O it is an anion with six electrons, meeting the Hückel rule for anti-aromaticity O it is an anion with four electrons, meeting the Hückel rule for aromaticity
- Use arrows to predict the final favored product of the following Diels-Alder reaction. Use the step-wise mechanism to predict the final product of the following reaction. Show stereochemistry at stereogenic centers. NaBH4 CH;OH Use the step-wise mechanism to predict the product of the following reaction. (Excess) H.The treatment of (CH3)2C = CHCH2Br with H2O forms B (molecular formula C5H10O) as one of the products. Determine the structure of B from its H NMR and IR spectra.The treatment of (CH3)2C=CHCH2Br with H2O forms B (molecular formula C5H10O) as one of the products. Determine the structure of B from its 1H NMR and IR spectra.