ࡱ> oqn 1bjbjcTcT .>>1 ++++ 7 +BCLjjjZ\\\\\\\jjjjj\q&&&jZ&jZ&&&@+|:&F0&=p=&=& jj&jjjjj\\&jjjjjjj=jjjjjjjjj : SYNTHESIS STRATEGIES FOR ORGANIC CHEMISTRY 1. Know how to prepare a functional group and what can be made from a functional group. For example, know how to prepare alkenes and what can be made from an alkene. The best way to memorize these reactions is to make flashcards. Include stereospecificity of reaction, where needed. This is most likely the most important tool you need to do synthesis problems. If you don't have these "basics" down, your success will be minimal. 2. If you don't see how to begin the synthesis, work backwards from the final product. Use the logic from step 1, above. Ask yourself, how would I prepare the final product in one step? (How do you prepare a functional group?) 3. Look for whether the number of carbons in the product has stayed the same or increased/decreased. For increasing carbons, consider Grignard reactions, coupling reactions, etc. For decreasing the number of carbons, decarboxylations, ozonolysis are common. 4. Alkenes and alcohols are good intermediates. With alkenes, many addition reactions are possible. Also, orientation of the additions (Markovnikov or Anti-markovnikov) gives you flexibility in designing a synthesis. With alcohols, substitutions and oxidation reactions are plentiful. For instance, addition of H2O/H+ across the double bond in 1-butene (Markovnikov addtion) would yield 2-butanol, which could be oxidized to butanone:  INCLUDEPICTURE "http://pages.towson.edu/ladon/image/synth1.gif" \* MERGEFORMATINET  On the other hand, addition of B2H6 with H2O2 (Anti-Markovonikov addition) would result in 1-butanol, which could be oxidized to butanal:  INCLUDEPICTURE "http://pages.towson.edu/ladon/image/synth2.gif" \* MERGEFORMATINET  5. With aromatic compounds, look at the orientation of substituents on the ring (ortho, meta, para) of the products, to help you decide in which order to add reagents. Know which substituents are ortho/para directors and which are meta directors. If the atom directly attached to the ring has one or more lone pairs, it will be an ortho/para director. Alkyl groups are also ortho/para directors. If the atom directly attached to the ring has a pi system (multiple bond) or a formal positive charge, it will be a meta director.  INCLUDEPICTURE "http://pages.towson.edu/ladon/image/synth3.gif" \* MERGEFORMATINET  In the above case, you would oxidize the methyl group to the carboxylic acid first, using KMnO4. Now that you have a meta director, nitrate the ring using HNO3 with H2SO4 as a catalyst.  INCLUDEPICTURE "http://pages.towson.edu/ladon/image/synth4.gif" \* MERGEFORMATINET  In the above reaction, you must nitrate the ring first, since a methyl group is an ortho/para director. After nitration, oxidize the methyl group to a carboxylic acid. Notice that oxidation, followed by nitration versus nitration followed by oxidation gave very different products. 6. You must practice doing synthesis problems -- it's not a "spectator sport". As with any skill, the more you practice, the more proficient you become at that skill. Copyright, 2001, L. Ladon. Permission is granted to use and duplicate these materials for non-profit educational use, under the following conditions: No changes or modifications will be made without written permission from the author. 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