How to pronounce“deprotonation”in English

The deprotonation of the beta-keto ester at the end is effectively pulling the whole reaction along, so we need enough base for that to happen.

A final deprotonation gives us the protected dipeptide, along with a dialkyl urea by-product.

We start with deprotonation of the enolizable ketone.

The final deprotonation makes another enolate, and once we protonate that, we're left with a neutral product and a shiny, new carbon-carbon bond!

After a deprotonation, we get an imine.

And the E1 mechanism has two steps: loss of a leaving group followed by deprotonation, and the rate depends on the concentration of the substrate.

And finally, there's one more deprotonation to give the final product.