Supplier Page from Thermo Fisher Scientific for Copper(II) methoxide, typically 98% (metals basis)
2-Mesitylenesulfonyl chloride, 99% from Thermo Fisher Scientific
DL-Methionine, 99+% from Thermo Fisher Scientific
Maleic acid, 99% from Thermo Fisher Scientific
Phenylselenol, 98% from Thermo Fisher Scientific