Supplier Page from Thermo Fisher Scientific for trans-2-Pentenoic acid, 90+%, remainder other isomers
2-Ethoxyethyl ether, 98+%, extra pure from Thermo Fisher Scientific
4'-Fluoroacetophenone, 99% from Thermo Fisher Scientific
Ethyl 2-hydroxyethyl sulfide, 98% from Thermo Fisher Scientific
Ethyl cyanoformate, 99% from Thermo Fisher Scientific