Supplier Page from Thermo Fisher Scientific for Tetrafluoroboric acid, ca 50% w/w aq. soln
Ethyl 4-chlorobutyrate, 97% from Thermo Fisher Scientific
Ethyl bromopyruvate, 80-85% from Thermo Fisher Scientific
Ethyl cyanoacetate, 98+% from Thermo Fisher Scientific
Ethyl propiolate, 99% from Thermo Fisher Scientific