Supplier Page from Thermo Fisher Scientific for Tantalum foil, 0.025mm (0.001in) thick, hard, 99.95% (metals basis)
Ethyl 4-chlorobutyrate, 97% from Thermo Fisher Scientific
Ethyl N-piperazinecarboxylate, 99% from Thermo Fisher Scientific
Ethyl propiolate, 99% from Thermo Fisher Scientific
N-Ethylaniline, 98% from Thermo Fisher Scientific