The Diels-Alder Reaction
Music (Somewhere over the Rainbow) by Judy Garland
Lyrics by Molly Mulfur

to do the Diels-Alder reaction, regiochemistry
must be considered to find out what the product will be
you need the electron withdrawing group and the donating group too
on opposite molecules to get products 1,4 and 1,2

the MO theory lets you know
if the reaction will be a go
no exceptions
the endo rule says one more thing
the dienophile, it must point in
stereochemistry

if you form a stereocenter, keep in mind
more than just one product you will find