Question

Why are Diels Alder reactions important?

Answer 1

Well, it's a `C-C` bond formation reaction.......

Explanation:

And as you know `C-C` bond formation is supported by very FEW organic reactions.

And, in the modern schemes of reaction, sometimes geometric and stereo-control can be built in; this is another very big deal.

The simple Diels Alder reaction can make up to 2 new `C-C` or `C-"heteroatom"` bonds.