Direct, one-pot synthesis of POCOP-type pincer complexes from metallic nickel

Abstract

A one-pot procedure has been developed for the direct and atom-economical preparation of the pincertype complexes 3, 2 ). This convenient synthetic protocol involves heating a 1 : 2 : 1-2 mixture of resorcinol (or its substituted derivatives), R 2 PCl, and nickel powder in toluene (at 100 °C) or acetonitrile (at 75 °C) for 18 h. The target nickel compounds can be obtained from this procedure in up to 93% yield.Using metallic palladium in this protocol instead of nickel gives the corresponding palladium complexes in low yields only (ca. 10%). Chart 1Scheme 1 † Electronic supplementary information (ESI) available: Tables of crystal dataand collection/refinement parameters. Complete details of the X-ray analyses. CCDC 928921 (2), 928922 (3) and 928920 (4). For ESI and crystallographic data in CIF or other electronic format see

d8 Nickel and palladium difluorocarbenes derived from trifluoromethyl POCOP-type pincer complexes

“…We began by preparing nickel and palladium iPr POCOP [ iPr POCOP = κ P ,κ C ,κ P -(2,6-( i Pr 2 PO) 2 -C 6 H 3 )] complexes ( iPr POCOP)MCl (M = Ni (1-Cl), Pd (2-Cl)), 1-Cl according to a direct, onepot method, [15] and 2-Cl using standard stepwise procedures (Scheme 1). [16] Scheme 1.…”

Recent Advances on the Chemistry of POCOP–Nickel Pincer Compounds

“…Although the approaches are very similar, these procedures may define the further progress of the POCOP-Ni pincer chemistry. The first one uses Ni(0) powder in a one-pot procedure [53]. The reasoning behind this method is very interesting; if the reaction to synthesize the ligand produces HCl, its reaction with the Ni (0) powder may actually generate NiCl 2 in situ which in turn reacts with the POCHOP ligand to generate the POCOP-NiCl complex plus hydrogen and more HCl (Fig.…”

Retracted: Catalytic activity of Fe(II) and Cu(II) PNP pincer complexes for Suzuki coupling reaction

“…FT-IR spectra were recorded on a Bruker-Alpha ECO-ATR FTIR spectrometer. 1 H NMR (400 MHz) spectrum was recorded in Bruker AV 400 using TMS as an internal standard. 31 P{ 1 H} NMR (161.8 MHz) spectrum was recorded in VARIAN using H 3 PO 4 as an internal standard.…”

“…Transition metals have displayed excellent catalytic activity enabling several unfeasible chemical processes both viable as well as productive. Process viability depends majorly on the overall cost and ease of preparation of the pre‐catalysts which needs to be based on abundant metals and inexpensive ligands . Complexes bearing pincer ligands are among the organometallic complexes that have been established and recognized as effective pre‐catalysts for various reactions.…”

“…Process viability depends majorly on the overall cost and ease of preparation of the pre-catalysts which needs to be based on abundant metals and inexpensive ligands. [1] Complexes bearing pincer ligands are among the organometallic complexes that have been established and recognized as effective pre-catalysts for various reactions. Their unique metal bound structures, high thermal stability, and process viability makes them the most active catalysts for organic transformations involving the activation of bonds.…”