Palladium nanoparticles embedded on thiourea modified chitosan (TMC) are prepared in spherical and cubical shapes by intercalating Pd(OAc)2 in TMC, a natural bio-polymer, and a subsequent reduction using ellagic acid as a natural and green reducing source in water.
A visible light mediated C–H lactonization of 2-methyl-1,1′-biaryls with oxygen as the oxidant was developed, giving benzocoumarins in good yields.