Table 1 A summary of mass based green chemistry metrics

Yield /%

Mass of desired product/Theoretical maximum mass of product

AE/%

Relative molecular mass (RMM) of desired product/RMM reactants

[3]

RME/%

Mass of desired product/Total mass of reactants used

[4]

E-factor

Total mass waste/Mass of desired product

[5]

PMI

Total mass required/Mass of desired product = E-Factor + 1

[6]

gRME/%

$\begin{array}{l}\text{Mass}\text{of}\text{desired}\text{product}/\text{Total}\\ \text{mass}\text{required}=\frac{1}{\text{PMI}}\end{array}$

[7]