Supplier Page from Thermo Fisher Scientific for 1-Propylphosphonic acid cyclic anhydride, 50+% w/w soln. in dichloromethane
Emodin, 95%, tech from Thermo Fisher Scientific
Ethyl 4,4,4-trifluoroacetoacetate, 97% from Thermo Fisher Scientific
Ethyl oxalyl chloride, 98% from Thermo Fisher Scientific
Ethyl propiolate, 99% from Thermo Fisher Scientific