raney nickel sentence in Hindi
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- This company was bought by W . R . Grace and Company in 1963 and still produces Raney nickel to this day.
- The thioketal prepared from the ketone can be easily reduced by catalytic hydrogenation using Raney nickel in a reaction known as the Mozingo reduction.
- Catalytic hydrogenation over Raney nickel to reduce nitro group, then sodium borohydride reduces keto group to alcohol "'4 " '.
- Following the development of Raney nickel, other alloy systems with aluminium were considered, of which the most notable include copper, ruthenium and cobalt.
- The fatty amine is obtained from this by hydrogenation with any of a number of reagents, including Raney nickel or cobalt, and copper chromite catalysts.
- Raney nickel, a finely divided nickel-aluminium alloy, is one common form, though related catalysts are also used, including Raney-type catalysts.
- In the above scheme, the reductive cyclisation is effected by Raney nickel and hydrazine . sodium hydrosulfite, or iron in acetic acid are also effective reducing agents.
- Since Raney is a registered trademark of W . R . Grace and Company, only those products by its Grace Davison division are properly called " Raney nickel ".
- Commonly, leaching is conducted between 70 and 100 �C . The surface area of Raney nickel ( and related catalysts in general ) tends to decrease with increasing leaching temperature.
- Due to its large surface area and high volume of contained hydrogen gas, dry, activated Raney nickel is a pyrophoric material that should be handled under an inert atmosphere.
- The resulting sodium salt of 1-( nitromethyl ) cyclohexanol is added to acetic acid and shaken with hydrogen gas in the presence of W-4 Raney nickel catalyst.
- A high catalytic activity, coupled with the fact that hydrogen is absorbed within the pores of the catalyst during activation, makes Raney nickel a useful catalyst for many hydrogenation reactions.
- The required 2-methyl-1, 3-cyclohexanedione can be prepared from resorcinol by hydrogenation over Raney nickel to dihydroresorcinol as the enolate followed by alkylation with methyl iodide.
- Recently, it was found that Ni-B / MgO showed superior catalytic activity to that of Raney nickel and other common catalysts that have been used in the hydrogenation of sulfolene.
- He was the developer of a nickel catalyst that became known as Raney nickel, which is often used in industrial processes and scientific research for the hydrogenation of multiple covalent bonds present in molecules.
- Alternatively, the more generic terms " skeletal catalyst " or " sponge-metal catalyst " may be used to refer to catalysts that have physical and chemical properties similar to those of Raney nickel.
- Desulfurisation took place with Raney nickel and the reduction reaction also opened the lactone ring to the carboxylic acid which was converted to the ester "'64 "'by reaction with diazomethane.
- Hydrogenation with Raney nickel gives the diol "'9 "'which on a double Mitsunobu reaction ( with an amine proton donor ) gives the azafenestrane "'10 "'as the borane salt.
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- The secondary alcohols ( e . g ., isopropanol, 2-butanol, 3-pentanol ) are obtained by hydrogenating over a catalyst ( e . g ., Raney nickel ) the corresponding ketones ( e . g ., acetone, methyl ethyl ketone, diethyl ketone ).
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