scholarly journals Synthesis of aldehydes and ketones by the dehydrogenation of alcohols in the presence of a Raney nickel/aluminium isopropoxide/alumina catalyst

2004 ◽  
Vol 2 (1) ◽  
pp. 214-219 ◽  
Author(s):  
Ilie Tarta ◽  
Ioan Silberg ◽  
Mircea Vlassa ◽  
Ioan Oprean
Keyword(s):  
Raney Nickel ◽  
Secondary Alcohols ◽  
Aluminium Isopropoxide ◽  
Alumina Catalyst ◽  
Aldehydes And Ketones ◽  
Raney Ni ◽  
Al2o3 Catalyst

AbstractThe synthesis of aldehydes and ketones by the dehydrogenation of allylic and secondary alcohols using a Raney-Ni-Al(i-OPr)3-Al2O3 catalyst without hydrogen acceptors is presented.

Application of Dess-Martin oxidation in total synthesis of natural products

2020 ◽  
Vol 17 ◽  
Author(s):  
Majid M. Heravi ◽  
Tayebe Momeni ◽  
Vahideh Zadsirjan ◽  
Leila Mohammadi
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Selective Oxidation ◽  
Secondary Alcohols ◽  
Aldehydes And Ketones

: Dess–Martin periodinane (DMP), is a commercially available chemical, frequently being utilized as a mild oxidative agent for the selective oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones, respectively. DMP shows several merits over other common oxidative agent such as chromium- and DMSO-based oxidants, thus it is habitually employed in the total synthesis of natural products. In this review, we try to underscore the applications of DMP as an effective oxidant in an appropriate step (steps) in the multistep total synthesis of natural products.

The electrocatalytic hydrogenation of fused poly cyclic aromatic compounds at Raney nickel electrodes: the influence of catalyst activation and electrolysis conditions

1990 ◽  
Vol 68 (7) ◽  
pp. 1218-1227 ◽  
Author(s):  
Denis Robin ◽  
Michel Comtois ◽  
Anna Martel ◽  
René Lemieux ◽  
Amoy Kam Cheong ◽  
...  
Keyword(s):  
Raney Nickel ◽  
Supporting Electrolyte ◽  
Aqueous Sodium Hydroxide ◽  
Constant Current ◽  
Electrocatalytic Hydrogenation ◽  
Catalyst Activation ◽  
Nickel Electrodes ◽  
Initial Ph ◽  
Raney Ni ◽  
Tetrabutylammonium Chloride

The electrocatalytic hydrogenation (ECH) of phenanthrene, anthracene, and naphthalene has been investigated under constant current at Raney nickel electrodes in a mixed aqueous organic medium. The influence of various parameters on the efficiency of the process determined by the current efficiency (a measure of the competition between hydrogenation and hydrogen evolution, the only two electrochemical processes occurring), the extent of hydrogenation (yield of octahydro-derivatives), and the conversion rate was studied with phenanthrene. The best conditions were ethylene glycol or propylene glycol as cosolvent containing between 1.5 to 5% of water, a neutral or slightly acidic medium containing boric acid (0.1 M) as buffer (initial pH of 2.6, final pH of 6.0–6.2), sodium chloride or tetrabutylammonium chloride as supporting electrolyte, a temperature of 80° C, and a current density of 42 to 84 mA/cm2. The most active electrodes (consisting of Raney Ni particles dispersed in a nickel matrix and surrounded by a layer of porous nickel) were obtained by leaching the dispersed alloy particles at 75 °C for 7 h in 30% aqueous sodium hydroxide. The electrohydrogenation stopped at derivatives with a single aromatic ring, namely the octahydrophenanthrenes, octahydroanthracenes, and tetralin. In a non-buffered medium, tetrahydrophenanthrene could be obtained with selectivities of 80% or better. Keywords: electrocatalytic hydrogenation, Raney nickel electrodes, phenanthrene, anthracene, naphthalene.

scholarly journals Photochemical oxidation of benzylic primary and secondary alcohols utilizing air as the oxidant

2020 ◽  
Vol 22 (2) ◽  
pp. 471-477 ◽  
Author(s):  
Nikolaos F. Nikitas ◽  
Dimitrios Ioannis Tzaras ◽  
Ierasia Triandafillidi ◽  
Christoforos G. Kokotos
Keyword(s):  
Photochemical Oxidation ◽  
Secondary Alcohols ◽  
Oxidation Of Alcohols ◽  
Aldehydes And Ketones

A mild and green photochemical protocol for the oxidation of alcohols to aldehydes and ketones was developed.

scholarly journals A biphasic oxidation of alcohols to aldehydes and ketones using a simplified packed-bed microreactor

2009 ◽  
Vol 5 ◽  
Author(s):  
Andrew Bogdan ◽  
D Tyler McQuade
Keyword(s):  
Packed Bed ◽  
Secondary Alcohols ◽  
Great Stability ◽  
Wide Range ◽  
Oxidation Of Alcohols ◽  
Aldehydes And Ketones ◽  
High Yields ◽  
By Products ◽  
Over Time

We demonstrate the preparation and characterization of a simplified packed-bed microreactor using an immobilized TEMPO catalyst shown to oxidize primary and secondary alcohols via the biphasic Anelli-Montanari protocol. Oxidations occurred in high yields with great stability over time. We observed that plugs of aqueous oxidant and organic alcohol entered the reactor as plugs but merged into an emulsion on the packed-bed. The emulsion coalesced into larger plugs upon exiting the reactor, leaving the organic product separate from the aqueous by-products. Furthermore, the microreactor oxidized a wide range of alcohols and remained active in excess of 100 trials without showing any loss of catalytic activity.

Hydrogen transfer reactions. I. Reduction of carbonyl compounds by alcohols catalyzed by alumina

1969 ◽  
Vol 47 (19) ◽  
pp. 3705-3707 ◽  
Author(s):  
D. V. Ramana ◽  
C. N. Pillai
Keyword(s):  
Vapor Phase ◽  
Carbonyl Compounds ◽  
Hydrogen Transfer ◽  
Isopropyl Alcohol ◽  
Aromatic Aldehydes ◽  
Transfer Reactions ◽  
Secondary Alcohols ◽  
Effective Catalyst ◽  
Phase Reduction ◽  
Aldehydes And Ketones

Alumina containing about 2.2% by weight of Na+ has been found to be an effective catalyst for the vapor phase reduction of carbonyl compounds by alcohols and for the reverse reaction, the oxidation of the alcohols by carbonyl compounds. The reduction of a number of aliphatic and aromatic aldehydes and ketones by isopropyl alcohol and the oxidation of a number of primary and secondary alcohols by ketones like acetone and cyclohexanone are reported.

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