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Author: Subject: Carbene mechanism with malononitrile
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[*] posted on 9-1-2014 at 09:00
Carbene mechanism with malononitrile


Hello guys,

I just get a practical problem: what happens if malononitrile is reacted with sodium in EtOH, is it right that a carbanion intermediate exists?

If this is true, what reaction mechanism takes place with this pyranone?

Since I suffering for a while about insertion mechanisms and carbene chemistry it seems impossible for me to explain what the product is?

Reaction scheme is given below

Additional background is very welcome!

ScreenHunter_101 Jan. 09 17.40.jpg - 12kB
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UnintentionalChaos
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[*] posted on 9-1-2014 at 09:50


There is no carbene there. That is a carbanion. A carbene is a charge-neutral carbon species with two substituents and a pair of electrons (whose configuration can be singlet or triplet). You have a carbanion (a relatively weak one) and an activated alkene.

http://www.organic-chemistry.org/namedreactions/michael-addi...




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solo
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[*] posted on 9-1-2014 at 15:32


.....just to clarify, this JAVA is not the java of the hive or any other forum.......java is solo here ....i just thought i clarify that since many know me as java .....solo/java




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[*] posted on 28-2-2014 at 08:53


Thank you UnintentionalChaos. It wasn't explained on the university. Then I suppose that this is the mechanism for the 1,4-Michael Addition:

ScreenHunter_147 Feb. 28 17.38.jpg - 9kB

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