The coordination chemistry of pyrazole-derived ligands

History, overview and applications of mediated lignolytic systems, especially laccase-mediator-systems (Lignozym-process)

N,N′-Chelating biheteroaromatic ligands; a survey

Propargyl methacrylate with its acetylene function protected with a silyl group is polymerized via the reversible addition fragmentation chain transfer (RAFT) process, using cyanoisopropyl dithiobenzoate (CPDB) as RAFT agent, and subsequently deprotected to afford a polymer backbone where each repeated unit is decorated with an acetylene functionality (1000 < Mn < 13,600 g mol-1, 1.07 < PDI < 1.29). In parallel, an azide functionalized xanthate (ethoxythiocarbonylsulfanyl-acetic acid 3-azido-propyl ester) was employed to prepare narrow polydisperse poly(vinyl acetate) (M n = 850 g mol-1, PDI = 1.20). The two polymers are conjugated by Huisgen 1,3-dipolar cycloaddition to afford narrow polydisperse comb polymer (1.12 < PDI < 1.18, 3400 < Mn < 12,500 g mol-1, based on linear polystyrene calibration, 4500 < M n theo < 15,600 g mol-1). The study places special emphasis on following the copper catalyzed 1,3-dipolar cycloaddition via Fourier Transform Infrared Spectroscopy (FTIR) as well as via on-line UV-Vis photospectrometry on several model compounds, i.e. the nonmonomer inserted azido-xanthate RAFT/MADLX. agent as well as a 2-propargyl-2-bromopropionate and 3-azidopropyl-2-bromopropionate model compounds. A suitable absorption band in the VIS at 666 nm (tentatively assigned to a charge transfer complex between copper(I) and the forming triazole moieties) is identified as a promising sensor for following the click reaction kinetics, thus allowing for the rapid assessment of reaction completion in an on-line fashion. © 2007 Wiley Periodicals, Inc.

Graft block copolymers of propargyl methacrylate and vinyl acetate via a combination of RAFT/MADIX and click chemistry: Reaction analysis

FT-IR and XPS study of copper(II) complexes of imidazole and benzimidazole

Coordination compounds of benzotriazole and related ligands

Metal coordination compounds of thiabendazole

Formation of solid fluoride complexes from metal(II) tetrafluoroborates

Transition metal 2,4,6-trichlorophenolates coordinated by imidazole, N-methylimidazole and 1,2-dimethylimidazole

Transition metal compounds containing substituted imidazole ligands and substituted phenoles as anions

J.A.M. van Hest

Papers

Coordination compounds of benzotriazole and related ligands

Metal coordination compounds of thiabendazole

Formation of solid fluoride complexes from metal(II) tetrafluoroborates

Transition metal 2,4,6-trichlorophenolates coordinated by imidazole, N-methylimidazole and 1,2-dimethylimidazole

Transition metal compounds containing substituted imidazole ligands and substituted phenoles as anions