scholarly journals Catalytic Hydrogenation of Furfural Diethyl Acetal to Ethyl Furfuryl Ether

2021 ◽  
Vol 14 (3) ◽  
pp. 281-289
Author(s):  
Valery E. Tarabanko ◽  
◽  
Irina L. Simakova ◽  
Marina A. Smirnova ◽  
Konstantin L. Kaygorodov ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Palladium Catalyst ◽  
Furan Ring ◽  
Main Product ◽  
Diethyl Acetal ◽  
Reduced Forms

The process of catalytic hydrogenation of furfural diethyl acetal to ethyl furfuryl ether on the different catalysts (palladium, palladium-rhenium and copper-ruthenium on Sibunit in reduced forms) was studied. It was found that hydrogenation of the furan ring with the formation of THF diethyl acetal occurs on all the catalysts. Ethyl furfuryl ether becomes the main product while carrying on the second hydrogenation cycle on spent palladium catalyst (yield and selectivity up to 55 % and 85 %, respectively)

scholarly journals Catalytic hydrogenation in the process of 2-((1-benzylpiperidin-4-yl) methyl)-5,6-dimethoxy-2,3-dihydroinden-1-one hydrochloride synthesis I. Catalyst screening and finding the optimal reaction conditions

2012 ◽  
Vol 14 (3) ◽  
pp. 38-47 ◽  
Author(s):  
Zrinka Mastelic Samardzic ◽  
Stanka Zrncevic
Keyword(s):  
Catalytic Hydrogenation ◽  
Hydrogen Pressure ◽  
Main Product ◽  
Catalyst Activity ◽  
Solvent Polarity ◽  
Catalyst Loading ◽  
Hydrogenation Rate ◽  
Reaction Conditions ◽  
Catalyst Screening ◽  
Optimal Reaction

1 Catalytic hydrogenation of 2-((1-benzyl-1,2,3,6-tetrahydropyridin-4-yl)methylene)-5,6-dimethoxy-2,3-dihydroinden- 1-one hydrochloride () to 2-((1-benzylpiperidin-4-yl)methyl)-5,6-dimethoxy-2,3-dihydroinden- 1-one hydrochloride (2) was investigated in the batch-slurry reactor. The 5% Pt/C catalyst was chosen to search the optimal reaction conditions because of its higher catalytic activity compared to other catalysts used in the work. To investigate the catalyst activity, selectivity and stability, the effect of agitation speed, catalyst loading, solvent, temperature, hydrogen pressure and catalyst reuse were studied. The initial rate of hydrogenation increases with the increase of catalyst loading, with the temperature and solvent polarity, if alcohols were used as solvents. The hydrogenation rate decreases with higher hydrogen pressure and that was explained by competitive adsorption of both reactants. The results also indicate that 5% Pt/C is a promising catalyst for 1 hydrogenation because at relatively mild reaction conditions selectivity towards main product was high (98%) and catalyst maintains its activity during successive runs.

Catalytic Hydrogenation of Pyrylium Salts: A Convenient Route to Alkyl-Substituted Tetrahydropyrans

1986 ◽  
Vol 41 (4) ◽  
pp. 502-504 ◽  
Author(s):  
Gheorghe Mihai ◽  
Teodor-Silviu Balaban
Keyword(s):  
Catalytic Hydrogenation ◽  
Palladium Catalyst ◽  
Reaction Conditions ◽  
Pyrylium Salts ◽  
Convenient Route ◽  
High Yields

2,4.6-Trialkylpyrylium perchlorates afford in high yields by hydrogenation on palladium catalyst at room tem perature the corresponding all-dis-2,4.6-trialkyltetrahydropyrans, whereas other reaction conditions lead to mixtures of tetrahydropyrans and hydrogenolyzed products

Hydrogenation and isomerisation of unsaturated compounds on a palladium catalyst

1980 ◽  
Vol 45 (12) ◽  
pp. 3532-3540 ◽  
Author(s):  
Libor Červený ◽  
Alena Lövyová ◽  
Vlastimil Růžička
Keyword(s):  
Catalytic Hydrogenation ◽  
Palladium Catalyst ◽  
Reaction Rate ◽  
Dominant Effect ◽  
Unsaturated Alcohols ◽  
Effect Of Solvents ◽  
Unsaturated Compounds ◽  
Substrate Structure ◽  
Starting Compound

Catalytic hydrogenation and simultaneous isomerisation of 1- and 2-hexene and of three unsaturated alcohols was studied under normal conditions on a palladium catalyst. The effect of solvents and of substrate structure on the course of this reaction is reported. The structure of the starting compound was found to have dominant effect on the selectivity of hydrogenation while solvents influenced significantly the reaction rate and selectivity of competition reactions of 1-hexene and unsaturated alcohols.

Catalytic hydrogenation of aldehydes and ketones using cinchona–bipyridyl-based palladium catalyst

2018 ◽  
Vol 16 (2) ◽  
pp. 373-384 ◽  
Author(s):  
Ramasamy R. Chidambaram ◽  
Velu Sadhasivam ◽  
Mathappan Mariyappan ◽  
Ayyanar Siva
Keyword(s):  
Catalytic Hydrogenation ◽  
Palladium Catalyst ◽  
Aldehydes And Ketones

scholarly journals PARALLEL REACTION ON CATALYTIC HYDROGENATION REACTION OF CIS-ISOEUGENOL INTO 2-METHOXY-4-PROPYLPHENOL

2010 ◽  
Vol 5 (2) ◽  
pp. 169-172
Author(s):  
Muchalal Muchalal
Keyword(s):  
Catalytic Hydrogenation ◽  
Catalytic Reaction ◽  
Main Product ◽  
Hydrogenation Reaction ◽  
Raw Material ◽  
Parallel Reaction ◽  
Conversion Reaction ◽  
No Conversion ◽  
Irreversible Reaction ◽  
Equilibrium Reaction

Catalytic hydrogenation of eugenol (Mr 164) and isoeugenol (Mr 164) by using synthetic catalyst Ni/-Al2O3 had been carried out. Eugenol transformation into 2-methoxy-4-propylphenol (Mr 166) as a main product could be achieved in 100% and no conversion reaction of eugenol into isoeugenol. If the raw material was 96% trans-isoeugenol or 61% cis-isoeugenol then the product was 67% or 92% of 2-methoxy-4-propylphenol. On the catalytic hydrogenation of trans-isoeugenol into 2-methoxy-4-propylphenol there was no parallel reaction of trans-isoeugenol into cis-isoeugenol. Conversely, catalytic reaction of cis-isoeugenol into 2-methoxy-4-propylphenol always followed by conversion reaction of cis-isoeugenol into trans-isoeugenol. Transformation of cis-isoeugenol into 2-methoxy-4-propylphenol below 200 oC was equilibrium reaction and above 200 oC was an irreversible reaction.   Keywords: Catalytic hydrogenation, cis-isoeugenol

Catalytic hydrogenation of the adduct of citral diethyl acetal with 2-methoxy-propene, and the synthesis of 6,10-dimethylundec-3-en-2-one

1987 ◽  
Vol 36 (12) ◽  
pp. 2590-2595
Author(s):  
G. M. Zhdankina ◽  
L. M. Kozlova ◽  
G. V. Kryshtal' ◽  
E. F. Litvin ◽  
E. P. Serebryakov ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Diethyl Acetal
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