SUZUKI CROSS-COUPLING IN ENVIRONMENTALLY FRIENDLY SOLVENTS IN A BATCH MODE USING HYPERCROSSLINKED POLYSTYRENE-SUPPORTED PD CATALYSTSстатья
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Дата последнего поиска статьи во внешних источниках: 13 ноября 2019 г.
Аннотация:This work is devoted to the synthesis of Pd-containing catalysts based on hypercrosslinked polystyrene (HPS) and study of their catalytic properties in Suzuki cross-coupling of 4-bromoanisole (4-BrAn) and phenylboronic acid (PBA). Series of Pd-containing HPS-based catalysts were synthesized at variation of Pd content and tested in Suzuki cross-coupling of 4-BrAn and PBA in a batch mode at ambient pressure while using ethanol (EtOH) and EtOH/water mixtures as solvents. The highest catalytic activity was observed at EtOH/water ratio of 5 : 1 while using NaOH as a base (the conversion of 4-BrAn has reached higher than 98% for less than 1 h of reaction time). Selectivity was higher than 95 % with respect to 4-methoxybiphenyl. Thus HPS-supported palladium catalysts were found to be promising (active, selective), simple in preparation and stable for at least three consecutive runs for the Suzuki
cross-coupling at mild temperatures along with the absence of the necessity to use phase transfer agents.