496 results about "Atom economy" patented technology

Atom economy (atom efficiency/percentage) is the conversion efficiency of a chemical process in terms of all atoms involved and the desired products produced. Atom economy is an important concept of green chemistry philosophy, and one of the most widely used metrics for measuring the "greenness" of a process or synthesis. Atom economy can be written as: atom economy=(Molecular Weight of desired product)/(Molecular Weight of all reactants)×100% For a multi-step process, where the intermediates are formed in one step and consumed during a later step: A+B→C C+D→E E+F→G atom economy=Mᵣ(G)/(Mᵣ(A)+Mᵣ(B)+Mᵣ(D)+Mᵣ(F)) Atom economy is a different concern than chemical yield, because a high-yielding process can still result in substantial byproducts.