Retrosynthetic Techniques for Aldehyde/Ketone Reactions
mostly review for my exam tomorrow
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from there proceed w/ elimination mechanism, using PBr3 to convert the OH to a Br and subsequent elimination w/ EtONa + EtOH also can use PBr3 to convert any alcohol to Br, then attack for Gringnard, these are important for extending carbon chains |dw:1539905085802:dw|
if you want to add an OH to the anti-markovnikov end use hydroboration oxidation BH3 with THF under peroxide conditions H2O2 |dw:1539905245855:dw|
if you need to add something to the terminal end of an alkyne use NaH to rip off the terminal hydrogen and XI where X is the group you want to add and I is the iodine to make a good LG
special case: if you want to extend the chain on an alcohol by exactly 2 carbons we can use a grignard to add oxirane; grignards will attack the least hindered end on the oxirane, opening up the ring, so the later O can be protonated with H3O+
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