Supplier Page from Thermo Fisher Scientific for 1-Propylphosphonic acid cyclic anhydride, 50+% w/w soln. in dichloromethane
4-Ethylresorcinol, 98% from Thermo Fisher Scientific
Ethyl (ethoxymethylene)cyanoacetate, 98% from Thermo Fisher Scientific
Ethyl 4-dimethylaminobenzoate, 99+% from Thermo Fisher Scientific
Ethyl isonipecotate, 98+% from Thermo Fisher Scientific