Showing papers on "Nickel boride published in 1973"
TL;DR: In this article, the optimum conditions for the desulphurisation of ethylene dithioacetals with nickel boride were defined, and a mixture of saturated and unsaturated products was formed.
Abstract: Optimum conditions are defined for the desulphurisation of ethylene dithioacetals with nickel boride. Normally a mixture of saturated and unsaturated products is formed. Nickel boride is inferior to Raney nickel for the desulphurisation of thiophens. Hemithioacetals are rapidly cleaved by nickel boride, allowing regeneration of the ketone. Triterpene 2-enes are obtained in excellent yield from 3-ketones by desulphurisation of intermediate benzyl thio(enol ether)s with either nickel boride or Raney nickel.
38 citations
TL;DR: In this article, the poisoning effect on nickel and nickel boride catalysts in the liquid-phase hydrogenation of styrene and the bond strength of inhibitors on the catalysts has been studied by means of liquid phase chromatography using a thermal detector.
Abstract: The relation between the poisoning effect on nickel and nickel boride catalysts in the liquid-phase hydrogenation of styrene and the bond strength of inhibitors on the catalysts has been studied by means of liquid-phase chromatography using a thermal detector. The results show that the sequence of poisoning effect is in agreement with that of the adsorption heat of inhibitors, and that the adsorption heat of each inhibitor on nickel boride is smaller than that on nickel. Besides, this sequence is also in agreement with that of the bond strength of the central metal ion and the coordinated ligand of some manganese complexes in a homogeneous system. These facts indicate that the adsorption energy of inhibitors on a catalyst in a heterogeneous system corresponds to the bond strength of the ligand coordinated to metal complexes in a homogeneous system.
27 citations