ChemInform Abstract: ALDOL-CONDENSATION PRODUCTS FROM THE MULTIPLE ANIONS OF OXIMES, BENZANILIDES, A BENZAMIDE, AND O-TOLYLANILIDES

1978 ◽  
Vol 9 (32) ◽  
Author(s):  
C. F. BEAM ◽  
C. A. PARK ◽  
D. C. REAMES ◽  
S. A. MILLER ◽  
C. R. HAUSER
Keyword(s):  
Aldol Condensation ◽  
Condensation Products

The effect of the position of the methyl group on the helical twisting powers of aldol condensation products of methyl cyclohexanones

2002 ◽  
Vol 29 (7) ◽  
pp. 995-1000 ◽  
Author(s):  
J. Lub ◽  
W. Ten Hoeve ◽  
W. P. M. Nijssen ◽  
L. Diaz ◽  
R. T. Wegh
Keyword(s):  
Aldol Condensation ◽  
Methyl Group ◽  
Condensation Products

scholarly journals Microwave-Assisted Aldol Condensation of Furfural and Acetone over Mg–Al Hydrotalcite-Based Catalysts

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 833
Author(s):  
Alberto Tampieri ◽  
Matea Lilic ◽  
Magda Constantí ◽  
Francesc Medina
Keyword(s):  
Metal Oxide ◽  
Fossil Fuel ◽  
Aldol Condensation ◽  
Polymeric Materials ◽  
Mixed Metal Oxide ◽  
Mixed Metal ◽  
Microwave Assisted ◽  
Condensation Products ◽  
Microwave Reactor ◽  
Co Precipitation

The depletion of fossil fuel resources has prompted the scientific community to find renewable alternatives for the production of energy and chemicals. The products of the aldol condensation between bio-based furfural and acetone have been individuated as promising intermediates for the preparation of biofuels and polymeric materials. We developed a protocol for the microwave-assisted condensation of these two compounds over hydrotalcite-based materials. Mg:Al 2:1 hydrotalcite was prepared by co-precipitation; the obtained solid was calcined to afford the corresponding mixed metal oxide, which was then rehydrated to obtain a meixnerite-type material. The prepared solids were characterized by PXRD, ICP-AES, TGA-DSC and N2 physisorption, and tested as catalysts in the aldol condensation of acetone and furfural in a microwave reactor. The performance of the catalysts was assessed and compared; the meixnerite catalyst proved to be the most active, followed by the mixed metal oxide and the as-synthesized hydrotalcite, which has often been reported to be inactive. In all cases, the reaction is quite fast and selective, which makes our protocol useful for rapidly converting furfural and acetone into their condensation products.

scholarly journals Novel Polymer–Silica Composite-Based Bifunctional Catalysts for Hydrodeoxygenation of 4-(2-Furyl)-3-Buten-2-One as Model Substance for Furfural–Acetone Aldol Condensation Products

2019 ◽  
Vol 9 (12) ◽  
pp. 2438 ◽  
Author(s):  
Michael Goepel ◽  
Ruben Ramos ◽  
Roger Gläser ◽  
David Kubička
Keyword(s):  
Noble Metals ◽  
Aldol Condensation ◽  
Sol Gel ◽  
Reaction Networks ◽  
Bifunctional Catalysts ◽  
Acidic Properties ◽  
Condensation Products ◽  
Silica Composite ◽  
Model Substance ◽  
High Yields

Novel bifunctional metal-loaded polymer–silica composite (PSC) catalysts were investigated in the hydrodeoxygenation (HDO) of 4-(2-furyl)-3-buten-2-one (FAc) as a model substance for furfural–acetone aldol condensation products. PSC catalysts were synthesized via a sol–gel method with different polymer contents and subsequently doped with different noble metals. The product composition of the HDO of FAc could be tuned by using catalysts with different polymer (i.e., acidic properties) and metal content (i.e., redox properties), showing the great potential of metal-loaded PSC materials as tunable catalysts in biomass conversions with complex reaction networks. Furthermore, high yields (>90%) of the fully hydrodeoxygenated product (n-octane) could be obtained using noble metal-loaded PSC catalysts in only 8 h of reaction time.

scholarly journals Complex chemical composition of colored surface films formed from reactions of propanal in sulfuric acid at upper troposphere/lower stratosphere aerosol acidities

2015 ◽  
Vol 15 (8) ◽  
pp. 4225-4239 ◽  
Author(s):  
A. L. Van Wyngarden ◽  
S. Pérez-Montaño ◽  
J. V. H. Bui ◽  
E. S. W. Li ◽  
T. E. Nelson ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Chemical Composition ◽  
Lower Stratosphere ◽  
Aldol Condensation ◽  
Surface Films ◽  
Upper Troposphere ◽  
Airborne Measurements ◽  
Cross Reactions ◽  
Organic Species ◽  
Condensation Products

Abstract. Particles in the upper troposphere and lower stratosphere (UT/LS) consist mostly of concentrated sulfuric acid (40–80 wt%) in water. However, airborne measurements have shown that these particles also contain a significant fraction of organic compounds of unknown chemical composition. Acid-catalyzed reactions of carbonyl species are believed to be responsible for significant transfer of gas phase organic species into tropospheric aerosols and are potentially more important at the high acidities characteristic of UT/LS particles. In this study, experiments combining sulfuric acid (H2SO4) with propanal and with mixtures of propanal with glyoxal and/or methylglyoxal at acidities typical of UT/LS aerosols produced highly colored surface films (and solutions) that may have implications for aerosol properties. In order to identify the chemical processes responsible for the formation of the surface films, attenuated total reflectance–Fourier transform infrared (ATR-FTIR) and 1H nuclear magnetic resonance (NMR) spectroscopies were used to analyze the chemical composition of the films. Films formed from propanal were a complex mixture of aldol condensation products, acetals and propanal itself. The major aldol condensation products were the dimer (2-methyl-2-pentenal) and 1,3,5-trimethylbenzene that was formed by cyclization of the linear aldol condensation trimer. Additionally, the strong visible absorption of the films indicates that higher-order aldol condensation products must also be present as minor species. The major acetal species were 2,4,6-triethyl-1,3,5-trioxane and longer-chain linear polyacetals which are likely to separate from the aqueous phase. Films formed on mixtures of propanal with glyoxal and/or methylglyoxal also showed evidence of products of cross-reactions. Since cross-reactions would be more likely than self-reactions under atmospheric conditions, similar reactions of aldehydes like propanal with common aerosol organic species like glyoxal and methylglyoxal have the potential to produce significant organic aerosol mass and therefore could potentially impact chemical, optical and/or cloud-forming properties of aerosols, especially if the products partition to the aerosol surface.

Aldol condensation products during photocatalytic oxidation of ethanol in a photoelectrochemical cell

2010 ◽  
Vol 100 (1-2) ◽  
pp. 124-132 ◽  
Author(s):  
Paraskevi Panagiotopoulou ◽  
Maria Antoniadou ◽  
Dimitris I. Kondarides ◽  
Panagiotis Lianos
Keyword(s):  
Photocatalytic Oxidation ◽  
Aldol Condensation ◽  
Photoelectrochemical Cell ◽  
Condensation Products ◽  
Oxidation Of Ethanol

Dimerization and cyclotrimerization of aldehydes: ruthenium catalyzed formation of esters, 1,3,5-trioxanes, and aldol condensation products from aldehydes

2004 ◽  
Vol 224 (1-2) ◽  
pp. 105-109 ◽  
Author(s):  
Angela Sorkau ◽  
Kerstin Schwarzer ◽  
Christoph Wagner ◽  
Eike Poetsch ◽  
Dirk Steinborn
Keyword(s):  
Aldol Condensation ◽  
Condensation Products

Towards understanding the hydrodeoxygenation pathways of furfural–acetone aldol condensation products over supported Pt catalysts

2016 ◽  
Vol 6 (6) ◽  
pp. 1829-1841 ◽  
Author(s):  
R. Ramos ◽  
Z. Tišler ◽  
O. Kikhtyanin ◽  
D. Kubička
Keyword(s):  
Aldol Condensation ◽  
Platinum Catalysts ◽  
Pt Catalysts ◽  
Condensation Products ◽  
Supported Platinum ◽  
Supported Pt Catalysts ◽  
Supported Platinum Catalysts ◽  
Acetone Condensation

Aiming at the valorisation of furfural-derived compounds, the hydrodeoxygenation of furfural–acetone condensation products has been studied using supported platinum catalysts.

scholarly journals Naturally Occurring Limonene to Cinnamyl-type γ-Butyrolactone Substituted Aldol Condensation Derivatives as Antioxidant Compounds

2012 ◽  
Vol 7 (9) ◽  
pp. 1934578X1200700
Author(s):  
Pushpinder Kaur ◽  
Pralay Das ◽  
Abha Chaudhary ◽  
Bikram Singh
Keyword(s):  
Antioxidant Activity ◽  
Benzene Ring ◽  
Aldol Condensation ◽  
Antioxidant Compounds ◽  
Condensation Products ◽  
Naturally Occurring ◽  
Derivatives Of

A method has been developed for the synthesis of γ-butyrolactone substituted cinnamyl type Aldol condensation products under milder proline and triethylamine basic conditions. The antioxidant activity of all the synthesized compounds was assessed using three different assays. The cinnamyl type derivatives of γ-butyrolactone bearing an -OH group in the benzene ring exhibited excellent antioxidant activity.

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