Recyclable cellulose nanocrystal supported Palladium nanoparticles as an efficient heterogeneous catalyst for the solvent‐free synthesis of coumarin derivatives via von Pechmann condensation.

Mirosanloo, Atieh; Zareyee, Daryoush; Khalilzadeh, Mohammad A.

2‐Amino pyrimidine nanocellulose‐supported Palladium nanoparticles (CNC‐AMPD‐Pd) as a novel bio supported nanocatalyst was prepared and characterized by ICP‐AES, FT‐IR, XRD, SEM, TEM, TGA and EDX techniques. The nanocatalyst demonstrated outstanding performance in Pechmann condensation between different substituted phenols and ethyl acetoacetate to obtain coumarin derivatives in good to excellent yields. The catalyst is easily recycled and reused without loss of the catalytic activity. The combined merits of reusable catalyst and solvent‐free reaction conditions make the condensation with safe operation, no leaching of pd into environment, low pollution, rapid access to products and simple workup. Preparation and characterization of palladium nanoparticles dispersed on the surface of 2‐amino pyrimidine functionalized‐cellulose nanocrystals as a novel, efficient and reusable heterogeneous nanocatalysts (CNC‐AMPD‐Pd) performed and then the prepared nanocatalyst applied successfully for the Pechmann reactions of different substituted phenols and ethyl acetoacetate to synthesize of various coumarin derivatives. The recovered catalyst reused in four successive runs with only a slight loss of activity.

PALLADIUM catalysts; NANOCRYSTALS; CELLULOSE; CATALYSTS recycling; METAL nanoparticles; HETEROGENEOUS catalysis; COUMARIN derivatives; CONDENSATION

Applied Organometallic Chemistry, 2018, Vol 32, Issue 12, pN.PAG

0268-2605

Academic Journal

10.1002/aoc.4546