scholarly journals Lignin and related compounds. II. Studies using ruthenium and Raney nickel as catalysts for lignin hydrogenolysis

1970 ◽  
Vol 48 (3) ◽  
pp. 477-479 ◽  
Author(s):  
J. M. Pepper ◽  
Y. W. Lee
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts ◽  
Spruce Wood ◽  
Catalytic Hydrogenolysis ◽  
Related Compounds

Five cyclohexyl compounds, derived from lignin, have been isolated and identified from the products of the catalytic hydrogenolysis of spruce wood over ruthenium and Raney nickel catalysts. One of these, 3-(4-hydroxy-3-methoxycyclohexyl)-1-propanol, a previously unreported compound, has been synthesized and characterized.

Synthetical applications of activated metal catalysts. XXV. The hydrogenolysis of some phenyl derivatives of silicon by Raney nickel

1966 ◽  
Vol 19 (10) ◽  
pp. 1897 ◽  
Author(s):  
WHF Sasse ◽  
KO Wade
Keyword(s):  
Raney Nickel ◽  
Silicon Atom ◽  
Atmospheric Pressure ◽  
Nickel Catalysts ◽  
Metal Catalysts ◽  
Derivatives Of ◽  
Related Compounds ◽  
Raney Cobalt

Tetraphenylsilane and 11 related compounds have been cleaved by treatment at atmospheric pressure with Raney nickel catalysts to give mixtures of benzene and cyclohexane. Yields exceeding 90% are obtained with degassed Raney nickel and silanes. Silanols and siloxanes are less readily spilt. The presence of methanol in the reaction mixtures retards the fission of silicon-phenyl bonds. Tetracyclo-hexylsilane, cyclohexyltrimethylsilane, and hexa(n-hexyl)disiloxane did not react detectably with Raney nickel. Raney cobalt had no effect on tetraphenylsilane. A mechanism for the new reaction is discussed which involves chemisorption via the silicon atom, ejection of a phenyl anion, and hydrogenolysis of the absorbed triphenylsilyl species.

Synthesis of 5-n-alkylresorcinol dimethyl ethers and related compounds via substituted thiophens

1971 ◽  
Vol 24 (12) ◽  
pp. 2655 ◽  
Author(s):  
D Buddhasukh ◽  
JR Cannon ◽  
BW Metcalf ◽  
AJ Power
Keyword(s):  
Raney Nickel ◽  
Stannic Chloride ◽  
Electrophilic Attack ◽  
Related Compounds ◽  
By Products

5-n-Alkylresorcinol dimethyl ethers have been synthesized by desulphurization of 2-(3,5-dimethoxybenzyl)-5-n-alkylthiophens with Raney nickel. The method has been adapted to the preparation of 9-(3,6- dimethoxyphenyl)nonyl alcohol which has been converted into both (2)- and (E)-15-(3,5-dimethoxyphenyl)pentadec-5-ene. ��� Friedel-Crafts acylation of 2-(3,5-dimethoxybenzyl)thiophen with n- hexoyl chloride, or with n-decoyl chloride, in the presence of stannic chloride, yielded the expected 2-(3,6-dimethoxybenzyl)-5-n- acylthiophens, but by-products were formed as the result of competing electrophilic attack on the 3,5-dimethoxybenzyl moiety. The chief by- products, which arise by subsequent Bradsher cyclodehydration, have been formulated as 5,7-dimethoxy-4-n-alkylnaphtho[2,3-b]thiophens. ��� An attempt to synthesize 1,14-bis(3,5-dimethoxyphenyl)tetradecane from 2,2?,6?,2?-terthienyl by an adaptation of this method was unsuccessful.

The Preparation and Aging of Raney Nickel Catalysts

1949 ◽  
Vol 71 (11) ◽  
pp. 3769-3771 ◽  
Author(s):  
Hilton A. Smith ◽  
William C. Bedoit ◽  
John F. Fuzek
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts

ChemInform Abstract: The Quantitative Recycling of Raney—Nickel Catalysts on a Lab-Scale.

ChemInform ◽  
2008 ◽  
Vol 39 (11) ◽  
Author(s):  
Waldemar M. Czaplik ◽  
Joerg-M. Neudoerfl ◽  
Axel Jacobi von Wangelin
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts

Synthetical Applications of Activated Metal Catalysts. XVI. The Role of Hydrogen in the Formation of 2,2'-Bipyridyl from Pyridine under the Influence of Degassed Raney Nickel

1963 ◽  
Vol 16 (1) ◽  
pp. 14 ◽  
Author(s):  
WHF Sasse ◽  
CP Whittle
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts ◽  
Nickel Atom ◽  
Metal Catalysts ◽  
Published Data ◽  
Hydrogen Atoms ◽  
Adsorbed Pyridine

The efficiency of W7 Raney nickel catalysts degassed between 30 and 400�C in the preparation of 2,2'-bipyridyl has been examined. The highest activities are observed with catalysts which have been degassed at 200�C, and these catalysts arc up to 20% more efficient than catalysts previously used and degassed at 100�C. The results obtained are compared with published data concerning the hydrogen contents of degassed Raney nickel catalysts (Kokes and Emmett 1959, 1960). This shows that catalysts which are virtually free of hydrogen are only 25% less efficient than catalysts degassed at l00�C (containing 65 to 70% of their original hydrogen). Because of this finding a new mechanism is proposed in which the adsorbed pyridine is activated by the transfer of an electron from the catalyst. On stereochemical grounds it is proposed that meso-2,2'-dihydro-2,2'-bipyridyl with axially disposed hydrogen atoms at the 2,2'-positions and bonded via both nitrogen atoms to one nickel atom is the energetically most favoured intermediate.

Stereoselective reduction with raney nickel catalysts

1973 ◽  
Vol 14 (20) ◽  
pp. 1773-1775 ◽  
Author(s):  
J.H.P. Tyman ◽  
S.W. Wilkins
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts ◽  
Stereoselective Reduction
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