72453-91-9Relevant academic research and scientific papers
Green and selective toluene oxidation–Knoevenagel-condensation domino reaction over Ce- and Bi-based CeBi mixed oxide mixtures
Varga, Gábor,Kukovecz, ákos,Kónya, Zoltán,Sipos, Pál,Pálinkó, István
, p. 308 - 315 (2020)
Both Bi- and Ce-based CeBi mixed oxides were prepared by a modified sol-gel process from their precursor salts. The mixed as well as the parent oxides were characterized by X-ray diffractometry, Raman, XPS, UV–DRS and X-ray photoelectron spectroscopies, ICP–OES method, scanning and transmission electron microscopies as well as BET surface area, CO2- and NH3-temperature-programmed desorption measurements. After characterizing the morphology, the acid-base properties, the oxidation states of the cationic components and the porosity of these structures, their catalytic activities were probed in the Koevenagel condensation of benzaldehyde and diethyl malonate and the toluene oxidation to benzaldehyde reactions. Based on the catalytic activities of the oxides in the individual reactions, a catalyst mixture from the Bi- and Ce-based mixed oxides was used successfully in the toluene to benzaldehyde oxidation and benzaldehyde to benzylidene malonate Knoevenagel condensation domino reaction under environmentally benign conditions.
Synthesis of β-hydroxymalonates: the direct aldol addition of malonates to aldehydes in the presence of SiCl4 and i-Pr2EtN
Massa, Antonio,Scettri, Arrigo,Filosa, Rosanna,Capozzolo, Laura
scheme or table, p. 7318 - 7321 (2010/02/28)
The direct aldol addition of malonates to aromatic, hetero-aromatic and unsaturated aldehydes leading to β-hydroxymalonates is described. The stability of these products, the trimethyl silyl protection of the hydroxyl group as well as the role of both SiC
SYNTHESIS OF 2,4-DINITRO- AND 2,4,6-TRINITROBENZYLIDENE COMPOUNDS BY KNOEVENAGEL CONDENSATION.
Kinastowski, Stefan,Wnuk, Stanislaw,Kaczmarek, Elzbieta
, p. 495 - 503 (2007/10/02)
Knoevenagel reaction between 2,4-dinitrobenzylaldehyde (1a) or 2,4,6-trinitrobenzaldehyde (1b) and malonic ester, ethyl cyanoacetate, cyanoacetamide, malononitrile, malonamide and its derivatives has been described.Different catalysts such as titanium tet
α,β-Unsaturated esters from the tri-n-butylarsine-promoted reaction of bromomalonic esters with aldehydes
Shen, Yanchang,Yang, Baozhen
, p. 45 - 50 (2007/10/02)
A convenient synthesis of α,β-unsaturated esters (in 68-96percent yields) from the reaction of a bromomalonic ester with aldehydes promoted by tri-n-butylarsine is descriebed.A mechanism involving halophilic attack of tri-n-butylarsine leading to the formation of a salt followed by reaction with carbonyl compounds is proposed.This methodology provides a convenient route to α,β-unsaturated esters and represents an alternative to the Knoevenagel reaction.
KINETIC INVESTIGATION ON ALDOLIC STAGE OF KNOEVENAGEL'S REACTION
Kinastowski, Stefan,Mroczyk, Wieslawa
, p. 179 - 184 (2007/10/02)
In order to explain the mechanism of the Knoevenagel's reaction between benzaldehyde and malonic ester, the aldolic stage of that reaction was investigated kinetically.The kinetics of the respective β-hydroxy compound decomposition in n-hexane and in methanol, as well as the influence of amine and amine salt on decomposition of this compound were investigated.The inhibiting influence of amine salts on the aldolic stage and the catalytic effect of amines in decomposition reaction were proved, in accordance with their basicity.
