期刊
APPLIED CATALYSIS A-GENERAL
卷 397, 期 1-2, 页码 94-102出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2011.02.019
关键词
Palladium(II) complexes; Chitosan membrane; Catalysts; Suzuki-Miyaura cross-coupling reaction; Water; Microwaves; Recycle
资金
- Fundacao para a Ciencia e a Tecnologia (FCT), Portugal
- FEDER
- FCT [SFRH/BPD/46812/2008]
- Institut Superior Tecnico (IST)
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/46812/2008] Funding Source: FCT
The fused bicyclic Delta 4-1,2,4-oxadiazoline trans-( PdCl2 {N=C(R)ONC(H)CH2CH2CMe2}(2)]) palladium(II) complex 1 (R=p-ClC6H4), in refluxing chloroform, undergoes N-O bond cleavage of the oxadiazoline ring to furnish the new ketoimine palladium(II) complex trans-([PdCl2{N(C(=O)(R))=6CH(2)CH(2)C(Me-2)NH}(2)]) 2 bearing the 4-chloro-N-(5,5-dimethylpyrrolidin-2-ylidene)benzamide ligands. Complexes 1 (R = Me) and 2 (R=p-ClC6H4) were immobilized on a chitosan membrane and the systems acted as supported-catalysts (Pd-chit 1 and Pd-chit 2, respectively) for the model microwave-assisted Suzuki-Miyaura cross-coupling reactions in water using p-bromoanisole and phenylboronic acid to give p-methoxybiphenyl in excellent yield. The effects of catalyst loading, temperature, time, the phase-transfer agent tetrabutylammonium bromide (TBAB) and base were investigated, and the supported catalyst was recovered and reused up to seven times, with a gradual loss of catalytic activity. (C) 2011 Elsevier B.V. All rights reserved.
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