Aktivierung von Kohlendioxid an Übergangsmetallzentren: Selektive Cooligomerisation mit hexin (cas 12765-33-2)(−3) durch das Katalysatorsystem Acetonitril/Trialkylphosphan/Nickel(0) und Struktur eines Nickel(0)-Komplexes mit side-on gebundenem Acetonitril

Add time:08/23/2019    Source:sciencedirect.com

CO2 reacts with hexyne(−3) in a catalytic reaction under formation of tetraethyl-2-pyrone, when the catalytic system alkyl3P/acetonitrile/nickel(0) is used. The selectivity of this homogeneous-catalytic reaction can be increased to values of 96% when phosphanes of high basicity and small cone angle are used.The investigation of the system Ni(COD)2/tricyclohexylphosphane/acetonitrile shows that acetonitrile can act as ligand in complexes of nickel(0). A yellow-brown tetranuclear complex was isolated, the structure of which was determined by X-ray diffraction studies. Acetonitrile acts as bridging ligand and is coordinated alkyne-analogously to one nickel center with its triple bond. The free electron pair of the nitrogen atom is bonded to a second nickel atom. Some reaction steps of this selective catalytic reaction are discussed.This reaction represents the first example of a selective homogeneous-catalytic co-oligomerization between CO2 and an unsaturated substrate which takes place under CC linkage with a 3d-transition metal.

We also recommend Trading Suppliers and Manufacturers of hexin (cas 12765-33-2). Pls Click Website Link as below: cas 12765-33-2 suppliers

Prev:Recovery and carbonation of 100% of calcium in waste concrete fines: Experimental results
Next:Preliminary communicationPolylithiumorganische Verbindungen: XVII. Splatung von 1,1′-Bicyclopropyliden (butterfly olefin) mit Lithiumpulver zu 1,6-Dilithio-3-hexin (cas 12765-33-2) über (1,3-Dilithiopropyliden)cyclopropan als isolierbare Zwischenstufe☆)