Journal
CATALYSTS
Volume 11, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/catal11020185
Keywords
Cu(I) complexes; phosphine; DAPTA ligands; carbon nanotubes; click chemistry; CuAAC; triazoles; microwave
Categories
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT), Portugal through Centro de Quimica Estrutural [UIDB/00100/2020]
- FCT [CEECINST/00102/2018]
- FCT/MCTES [UIDB/50006/2020, UIDP/50006/2020]
- Instituto Superior Tecnico, Portugal [CO2usE-1801P.00867.1.01, IST-ID/263/2019]
- RUDN University Strategic Academic Leadership Program
- CATSUS Ph.D. Program [PD/BD 135555/2018]
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A group of Cu(I) complexes with DAPTA phosphine ligands were immobilized on activated carbon and multi-walled carbon nanotubes for efficient catalysis in the one-pot synthesis of 1,2,3-triazoles via azide-alkyne cycloaddition reaction. The immobilized catalysts showed high catalytic activity and could be easily recovered and reused up to four consecutive cycles.
A set of Cu(I) complexes with 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo-[3.3.1]nonane (DAPTA) phosphine ligands viz. [CuX(kappa P-DAPTA)(3)] (1: X = Br; 2: X = I) and [Cu(mu-X)(kappa P-DAPTA)(2)](2) (3: X = Br; 4: X = I) were immobilized on activated carbon (AC) and multi-walled carbon nanotubes (CNT), as well as on these materials after surface functionalization. The immobilized copper(I) complexes have shown favorable catalytic activity for the one-pot, microwave-assisted synthesis of 1,2,3-triazoles via the azide-alkyne cycloaddition reaction (CuAAC). The heterogenized systems with a copper loading of only 1.5-1.6% (w/w relative to carbon), established quantitative conversions after 15 min, at 80 degrees C, using 0.5 mol% of catalyst loading (relative to benzyl bromide). The most efficient supports concerning heterogenization were CNT treated with nitric acid and NaOH, and involving complexes 2 and 4 (in the same order, 2 CNT-ox-Na and 4_CNT-ox-Na). The immobilized catalysts can be recovered and recycled by simple workup and reused up to four consecutive cycles although with loss of activity.
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