mar_03 - 1 The following reaction sequence would be a good...

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Unformatted text preview: 3/3/2010 1 The following reaction sequence would be a good synthesis of α-bisabolene. OH O A. Very sure this is true B. Somewhat sure this is true C. Maybe this is true D. Maybe this is false E. Somewhat sure this is false F. Very sure this is false α-bisabolene Which is the bad step? A B C D OH O α-bisabolene Is there a better synthesis? O P Ph Ph Ph O α-bisabolene How are Wittig reagents prepared? O P Ph Ph Ph O α-bisabolene Which of the following reactions would you predict to be faster? O Ph3P CH2 Ph 3 P CH 2 A O O CH 3 Ph3P CH OCH3 O C Ph 3 P CH OCH 3 O C O Ph 3 P CH OCH 3 O C B Are α , β-unsaturated esters useful? O H OH O O CH 3 Ph3P CH OCH3 O C O 1. H-Al(i-butyl)2 2. H 3 O 1. LiAlH 4 2. H 3 O very, very slow 3/3/2010 2 Why do the phosphonate anions react faster? O CH P CH OCH 3 O C O CH 3 O O O CH3 Ph 3 P CH OCH 3 O C O very, very slow O CH3 OCH 3 O fast How are phosphonate anions prepared?...
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mar_03 - 1 The following reaction sequence would be a good...

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