Atom Economy

Atom Economy = (RFM of useful product) / (RFM of reactants used) x 100

Rearrangement

Reorganises the constituent atoms within a molecule, none are lost so is 100% atom economical

Addition

Reactants are added together, no atoms lost = 100% atom economical

Substituion

The leaving group is not incorporated in the final product = atom economy always <100%

Elimination

Remove a group from a molecule, so there will alos be another product as well as the useful product = always <100% atom economical. Least economical.

Condensation = addition then eilmination