Fe 3 O 4 nanoparticle-supported Cu(II)-β-cyclodextrin complex as a magnetically recoverable and reusable catalyst for the synthesis of symmetrical biaryls and 1,2,3-triazoles from aryl boronic acids † Babak Kaboudin,* a Ramin Mostafalu a and Tsutomu Yokomatsu bWe report here on the preparation of an efficient, easily recoverable and reusable Fe 3 O 4 magnetic nanoparticle-supported Cu(II)-β-cyclodextrin complex catalyst for the synthesis of symmetrical biaryls and 1,2,3triazoles from arylboronic acids. The presented Fe 3 O 4 magnetic nanoparticle-supported Cu(II)-β-cyclodextrin complex catalyst was characterized by TEM, XRD, VSM, TGA, and FT-IR spectrometer. By using the catalyst, we have developed an efficient protocol for the homocoupling of aryl boronic acids for the synthesis of biaryls. The catalyst is also active in the synthesis of 1,2,3-triazoles via a one-pot reaction of an arylboronic acid with sodium azide in water followed by a click cyclization reaction with an alkyne at room temperature in air without any additives. The reusability of the prepared nanocatalyst was successfully examined four times with only a very slight loss of catalytic activity. † Electronic supplementary information (ESI) available: Details of the analytical data of the products of the homocoupling and 1,2,3-triazoles. See

Fe 3 O 4 magnetic nanoparticles-supported EDTA-copper(II) complex (Fe 3 O 4 -EDTA-Cu(II)) has been prepared and characterized by TEM, SEM, XRD, VSM, TGA, and FT-IR spectrometers. The catalyst was applied for the C-N coupling of arylboronic acids with amines for the preparation of N-aryl compounds.Recovery tests confirm that the catalyst can be easily recovered and reused up to eight times without significant loss of its catalytic activity.

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Cocoamidopropyl betaine (CAPB) is one of the most important amphoteric surfactants frequently used in cosmetic products, especially shampoos and bath products. Potentiometric and two-phase active titrations of commercial grade CAPB are not in good agreement. The findings of this study suggest dimethylaminopropylaminebetaines interfere with potentiometic titration.