- Thiol-promoted catalytic synthesis of diphenolic acid with sulfonated hyperbranched poly(arylene oxindole)s.
Thiol-promoted catalytic synthesis of diphenolic acid with sulfonated hyperbranched poly(arylene oxindole)s.
Chemical communications (Cambridge, England) (2012-03-02)
Stijn Van de Vyver, Jan Geboers, Sasja Helsen, Feng Yu, Joice Thomas, Mario Smet, Wim Dehaen, Bert F Sels
PMID22377560
ABSTRACT
Acid-catalyzed condensation of levulinic acid and phenol into high yields of diphenolic acid (>50%) is possible with a combination of sulfonated hyperbranched polymers and thiol promotors, either added as a physical mixture or bound to the polymer by ion-pairing.