Self-Assembled, Highly Positively Charged, Allyl-Pd Crowns: Cavity-Pocket-Driven Interactions of Fluoroanions

Chemistry : a European Journal
Montserrat FerrerMarianne Engeser

Abstract

A series of dodecanuclear highly positively charged homo- and heterometallamacrocycles [{Pd(η3 -2-Me-C3 H4 )}6 (4-PPh2 py)12 {M2 (tpbz)}3 ]18+ (M=Pd, Pt; tpbz=1,2,4,5-tetrakis(diphenylphosphanyl)benzene were synthesized by the quantitative self-assembly of {Pd(η3 -2-Me-C3 H4 )}+ , {M2 (tpbz)}4+ and 4-PPh2 py moieties in 2:1:4 molar ratio. The cationic assemblies were obtained as salts of different fluorinated anions with diverse sizes and electronic properties, namely BF4- , PF6- , SbF6- and CF3 SO3- . The new crown-like metallamacrocycles showed remarkable differences in their NMR spectra due to the presence of the different counteranions. On the basis of the observed variations, the metallacycles have been tested as catalytic precursors in allylic alkylation reactions. The anion-dependent activity and selectivity has been analysed and compared with that of the corresponding monometallic allylic corners [Pd(η3 -2-Me-C3 H4 )(4-PPh2 py)2 ]X (X=BF4- , PF6- , SbF6- , CF3 SO3- ). DFT calculations have been employed in order to help to the interpretation of the experimental data and to model the anion-crown interactions.

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Citations

Apr 30, 2021·Journal of the American Chemical Society·Jonas MaternGustavo Fernández

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