RecSet_2(CHEM 152L'09)

RecSet_2(CHEM 152L'09) - presence of maleic anhydride. What...

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Recitation Problem Set #2 CHEM 152L Summer Session 2009 1) Explain why a single pure product is obtained from the hydroboration-oxidation of 2-butyne, whereas two products are obtained from hydroboration-oxidation of 2-pentyne. 2) What will be the major product of 1-propyne with each of the following reagents: a) HBr(1 mol) b) HBr (2 mol) c) Aqueous H 2 SO 4 /HgSO 4 d) Disiamlyborane followed by H 2 O 2 /OH - e) Na/NH 3 f) NaNH 2 /NH 3 3) Give two sets of a conjugated diene and dienophile that could be used to prepare : O CH 3
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Recitation Problem Set #2 CHEM 152L Summer Session 2009 4) Which diene and which dienophile could be used to prepare the following compounds: O CH 3 Cl Cl CN CN O O O 5) The following equilibrium is driven to the right if the reaction is carried out in the
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Unformatted text preview: presence of maleic anhydride. What is the function of the maleic anhydride? H 3 C CH 3 O heat + O CH 3 CH 3 Recitation Problem Set #2 CHEM 152L Summer Session 2009 6) In 1935 J. Bredt, a German chemist, proposed that bicycloalkene cannot have a double bond at a bridgehead carbon unless one of the rings contains at least 8 carbon atoms. This is known as Bredts rule. Explain why there cannot be a double bond at the bridgehead carbon. bridgehead carbon 7) Cyclopentadiene can react with itself in a Diels-Alder reaction. Draw the endo and exo products....
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RecSet_2(CHEM 152L'09) - presence of maleic anhydride. What...

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