9 Most Syntheses Require More Than One Step And Usually The Precursors And Sometimes Even The Starting Materials Are No 1 (19.24 KiB) Viewed 23 times
9 Most Syntheses Require More Than One Step And Usually The Precursors And Sometimes Even The Starting Materials Are No 2 (32.08 KiB) Viewed 23 times
9. Most syntheses require more than one step and usually the precursors and sometimes even the starting materials are not given. Thus you must think backwards from the target and work towards a suitable starting material. In the following example: OH ?? OH stating 2. methylpertone Torget e-methyl, 8, 3 pontonediol
(HINT: look at the type of arrow drawn). (b) Begin with the target. Using retro arrows, draw the compound and reagents that could be used to form this target (it is not shown in the scheme above). This is your precursor. OH HX PBrz so da OH (c) Using the precursor molecule from question #9b, draw the compound and reagents that could be used to form this precursor, using retro arrows. Repeat this process until you get to the starting material shown above. (d) Show the entire forward synthesis, complete with reagents and precursors, that will lead from the starting material to the product shown above
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