Showing papers on "Nickel boride published in 1989"
TL;DR: Nickel boride (Ni2B) easily reduced aromatic nitro compounds at 40°C in 3N HCl or 15N NH4OH medium to afford the corresponding amines in good yields.
Abstract: Nickel boride (Ni2B) easily reduced aromatic nitro compounds at 40°C in 3N HCl or 15N NH4OH medium to afford the corresponding amines in good yields. However, olefin, aldehyde, ketone, nitrile, amide, carboxylic acid and ester functional groups were unaffected under these conditions.
16 citations
TL;DR: Cr, Co and Rh were introduced into P-1, P-2 and P2W nickel boride catalysts as promoters in this paper, but Cr and Co were only effective for P- 2W and P- 1 nickel borsides respectively.
Abstract: Cr, Co and Rh were introduced into P-1, P-2 and P-2W nickel boride catalysts as promoters. The substrates of cyclohexanone and cyclohexene were used to examine the effects of those promoters on nickel borides for hydrogenation reactions. On cyclohexanone with strongly-polared carbonyl group, Cr, Co and Rh are effective for all nickel borides. On cyclohexene with slightly-polared olefinic group, Rh is also good for all nickel borides. But Cr and Co are only effective for P-2W and P-1 nickel borides respectively.
14 citations
TL;DR: In this paper, the authors described the reduction of benzyl acetates selectively with nickel boride yielding corresponding corresponding hydrocarbons, and showed that the reduction can be done selectively with a nickel borate.
8 citations
Patent•
17 Apr 1989TL;DR: In this paper, a presinter treatment is provided to reduce oxygen contamination prior to sintering a predominantly iron powder compact comprising carbon powder and a liquating diffusible boron source.
Abstract: A presinter treatment is provided to reduce oxygen contamination prior to sintering a predominantly iron powder compact comprising carbon powder and a liquating diffusible boron source, such as nickel boride powder optionally in combination with iron boride powder. A preferred treatment is carried out at a temperature effective to dissociate iron oxide within the compact but not to initiate a liquid phase by said boron source and further is carried out in a vacuum to evacuate oxygen released thereby from compact pores prior to sintering. The presinter treatment enhances carbon and boron diffusion into the iron during sintering. In a preferred embodiment, the fraction of borocementite particles formed by diffused carbon and boron in the sintered iron structure is increased by the presinter treatment of this invention.
8 citations
TL;DR: Methanolic solutions of functionalized vic-dinitroalkanes treated with nickel boride under ultrasonic irradiation efficiently and quickly yield tetrasubstituted functionalized alkenes as discussed by the authors.
6 citations
Patent•
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14 Nov 1989
TL;DR: A sintering aid for powder metallurgical method for manufacturing an iron alloy article was described in this article, consisting of an oxygen getter and a boron-containing additive, such as nickel boride.
Abstract: A sintering aid is disclosed for use in a powder metallurgical method for manufacturing an iron alloy article by compacting and sintering a predominantly iron powder mixture comprising carbon powder and a boron-containing additive, such as nickel boride The sintering aid comprises an oxygen getter to inhibit boron oxidation that, if formed, is believed to retard carbon diffusion The sintering aid also preferably includes a second constituent to produce, in combination with the getter, a melting point suitable for forming a transient liquid phase during the early stages of sintering Preferred sintering aids include intermetallic iron titanium compounds, intermetallic ferro-vanadium compound and intermetallic nickel magnesium compound
TL;DR: Nickel boride (Ni2B) easily reduced aromatic nitro compounds at 40°C in 3N HCl or 15N NH4OH medium to afford the corresponding amines in good yields as mentioned in this paper.
Abstract: Nickel boride (Ni2B) easily reduced aromatic nitro compounds at 40°C in 3N HCl or 15N NH4OH medium to afford the corresponding amines in good yields. However, olefin, aldehyde, ketone, nitrile, amide, carboxylic acid and ester functional groups were unaffected under these conditions.