Supplier Page from Thermo Fisher Scientific for 1-Propanephosphonic acid cyclic anhydride, 50 wt.% solution in dimethylformamide
2-Ethylaniline, 98% from Thermo Fisher Scientific
3-Fluorobenzoic acid, 99% from Thermo Fisher Scientific
4'-Fluoroacetophenone, 99% from Thermo Fisher Scientific
Ethyl cyanoacetate, 98+% from Thermo Fisher Scientific