Synthesis and ligand-based reduction chemistry of boron difluoride complexes with redox-active formazanate ligands

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Abstract

Mono(formazanate) boron difluoride complexes (LBF ₂), which show remarkably facile and reversible ligand-based redox-chemistry, were synthesized by transmetallation of bis(formazanate) zinc complexes with boron trifluoride. The one-electron reduction product [LBF ₂] ⁻[Cp ₂Co] ⁺ and a key intermediate for the transmetallation reaction, the six-coordinate zinc complex (L(BF ₃)) ₂Zn were isolated and fully characterized.

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Aromatic rings in chemical and biological recognition: energetics and structures.

Laura M Salonen, Manuel Ellermann, François Diederich … (2011)

This review describes a multidimensional treatment of molecular recognition phenomena involving aromatic rings in chemical and biological systems. It summarizes new results reported since the appearance of an earlier review in 2003 in host-guest chemistry, biological affinity assays and biostructural analysis, data base mining in the Cambridge Structural Database (CSD) and the Protein Data Bank (PDB), and advanced computational studies. Topics addressed are arene-arene, perfluoroarene-arene, S⋅⋅⋅aromatic, cation-π, and anion-π interactions, as well as hydrogen bonding to π systems. The generated knowledge benefits, in particular, structure-based hit-to-lead development and lead optimization both in the pharmaceutical and in the crop protection industry. It equally facilitates the development of new advanced materials and supramolecular systems, and should inspire further utilization of interactions with aromatic rings to control the stereochemical outcome of synthetic transformations. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Lawrence Que, William Tolman (2008)

The development of processes for selective hydrocarbon oxidation is a goal that has long been pursued. An additional challenge is to make such processes environmentally friendly, for example by using non-toxic reagents and energy-efficient catalytic methods. Excellent examples are naturally occurring iron- or copper-containing metalloenzymes, and extensive studies have revealed the key chemical principles that underlie their efficacy as catalysts for aerobic oxidations. Important inroads have been made in applying this knowledge to the development of synthetic catalysts that model enzyme function. Such biologically inspired hydrocarbon oxidation catalysts hold great promise for wide-ranging synthetic applications.