Considers the by product of a reaction as well as the desired product.
By products are considered as waste but sometimes can be sold or recycled in the reaction.
A reaction with high atom economy has minimal waste, leading to less environmental waste.
Atom economy= molecular mass of desired products X 100
sum of molecular mass of all products
Addition reactions have an atom economy of 100%
Substitution and elimination reactions have an atom economy less than 100%
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