[lutesium]

Is there a name reaction for this conversion???
If the answer is no can someone explain the mechanism please???

 

[Arctic-Nation]

This probably is a two-step reaction. First, the malonic acid is decarboxylated, followed by a condensation with formaldehyde. You can easily find the mechanism for both.

[Smrt guy]

Looks like a decarboxylation followed by a Mannich reaction

[lutesium]

I knew that it was a decarboxylation but with these reagents how do they make a Mannich Reacton???
The main question in here is after decarboxylation with heat where can we apply the Mannich Reaction and where's the diEthyl Amine???

[Arctic-Nation]

Ah, Mannich, I knew it had a name but I'm losing my touch.

Decarboxylation leads to the loss of only one carboxylate, so after that you have intermediate form known as an alpha-carboxylate dianion. This is a pretty basic compound (usually it is prepared by reacting a carboxylic acid with LDA or even stronger bases). A rapid equilibration will happen, but I think that the small amount present will react readily with the Mannich reagent, shifting the equilibrium. After that, another acid/base shift will lose the diethylamine and convert the whole thing to an exomethylene.

At least, that's my idea. I might be wrong.

[lutesium]

I couldn't figure out what you tried to indicate!!! Can you draw a mechanism please???

Thanks

Lutesium...