Copper Hexafluorophosphate Research Articles

Novel N,N‐Bidentate Ligands for Enantioselective Copper(I)‐ Catalyzed Allylic Oxidation of Cyclic Olefins

AbstractNew N,N‐bidentate Schiff base ligands containing the 2‐quinolyl moiety proved to be effective in conferring high reactivity and moderate to high enantioselectivity (up to 84% ee) to the copper(I)‐catalyzed asymmetric allylic oxidation of various cylic olefins with tert‐butyl perbenzoate. As copper(I) sources, we employed copper(II) triflate/phenylhydrazine [Cu(OTf)2/PhNHNH2] and tetra(acetonitrile)copper hexafluorophosphate [Cu(CH3CN)4PF6]. Using the same N,N‐bidentate Schiff base ligand, the former showed high reactivity and the latter showed high enantioselectivity.

Study of Different Copper (I) Catalysts for the “Click Chemistry” Approach to Carbanucleosides

We compare herein the scope of three copper (I) catalysts on the synthesis of various 1,4-disubstitued-1,2,3-triazolo-carbanucleosides through a microwave (and thermic) assisted Huisgen 1,3-dipolar cycloaddition. The tetrakis(acetonitrile)copper hexafluorophosphate ([Cu(CH 3 CN)4]PF 6 ), the imidazoline(mesythyl)copper bromide (Imes)CuBr, and the copper/copper sulfate Cu(0)/CuSO 4 (II) mixture have been chosen for this study. Their influence in a catalytic amount will be analyzed according to the substituent of the alkyne, the solvent, or the heating method.

Anion Template Effect and the Polymerization Degree – Diversity through Flexibility

AbstractTwo 2D (M1 and M2) and one 1D (M3) metal‐organic frameworks (MOFs) have been prepared from pyridine functionalized tetradentate ligand tetrakis(nicotinoxymethyl)methane TNM with silver tetrafluoroborate, nickel chloride, and copper hexafluorophosphate. M1 manifests a previously unpresented mode of 4,4 threefold parallel interpenetration for 2D MOFs. Large channels (vdW diameter 9.4 Å) through eclipsed 2D layers of M2 were observed. While the open space percentage in the noninterpenetrated M2 was 38.0 %, the triple interpenetration of the sheets of M1 reduced the void to 10.8 %. With the same ligand and a similar, weakly coordinating anion as that in M1, the structure M3 was rendered one‐dimensional. The result is explained partly by the flexibility of the TNM ligand and partly by the lack of a suitable bridging solvent. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)