We describe the use of vanillin-based
monomers as a renewable feedstock
for the synthesis of cross-conjugated polymers. This transformation
exploits a catechyl-substituted phosphonite mediated multicomponent
polymerization to convert vanillin-derived diimines, commercial diacid
chlorides, and simple alkynes or alkenes into conjugated pyrrole-based
polymers. The flexibility of the multicomponent polymerization has
allowed for the efficient formation of families of vanillin-derived
fluorescent polymers with tunable properties. This includes coupling
vanillin with furan-based acid chlorides as the first cross-conjugated
polymer composed of both components of lignocellulosic biomass.
We describe the use of simple copper-salt catalysts in the selective aerobic oxidation of amines to nitriles or imines. These catalysts are marked by their exceptional efficiency, operate at ambient temperature and pressure, and allow the oxidation of amines without expensive ligands or additives. This study highlights the significant role counterions can play in controlling selectivity in catalytic aerobic oxidations.
We describe the use of simple copper-salt catalysts in the selective aerobic oxidation of amines to nitriles or imines. These catalysts are marked by their exceptional efficiency, operate at ambient temperature and pressure,a nd allow the oxidation of amines without expensive ligands or additives. This study highlights the significant role counterions can play in controlling selectivity in catalytic aerobic oxidations.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under http://dx.Scheme 3. Kinetic isotope effects and control experiments.Scheme 4. Proposed mechanism. Angewandte Chemie Communications 15805
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.