How the hell does a Phosp Ylide make a double bond???
I guessed because I have no idea what was going on in this section.
AAMC7: What the heck Orgo question.
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How the hell does a Phosp Ylide make a double bond???
I guessed because I have no idea what was going on in this section.
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http://en.wikipedia.org/wiki/Wittig_reaction
Just one of things you gotta remember on how to convert a ketone/aldehyde into an alkene!
Just one of things you gotta remember on how to convert a ketone/aldehyde into an alkene!
Basically: Wittig reaction swaps out a C=O fro a C=C.
If you ever see a question asking "How do we convert a ketone/aldehyle to an alkene?" Look for the ylide.
Anyway, you asked "how"
Notice that the ylide has 3 phenyl group and a phosphorus attached to a CH2 group. If you look up the structure you'll actually see it's a zwitterion with a negatively charged CH2 group. So ylide = carbanion= nucleophile.
So the ylide will act as a nucleophile and attack the electrophilic carbonyl carbon. That's how the new carbon-carbon bond is formed that yields the formation of an alkene.
If you ever see a question asking "How do we convert a ketone/aldehyle to an alkene?" Look for the ylide.
Anyway, you asked "how"
Notice that the ylide has 3 phenyl group and a phosphorus attached to a CH2 group. If you look up the structure you'll actually see it's a zwitterion with a negatively charged CH2 group. So ylide = carbanion= nucleophile.
So the ylide will act as a nucleophile and attack the electrophilic carbonyl carbon. That's how the new carbon-carbon bond is formed that yields the formation of an alkene.
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sorry i lawled
