Nano-silica PAMAM dendrimer as a novel catalyst for Knoevenagel reactions
A nano-silica dendrimer, poly(amidoamine)-grafted nanosilica (nano-PAMAM), catalyzed the Knoevenagel reaction of aryl and aliphatic aldehydes with various active methylene compounds at room temperature in good yields. The reaction conditions were mild eno
Unprecedented reaction between ethyl α-cyanocinnamate and o-phenylenediamine: Development of an efficient method for the transfer hydrogenation of electronically depleted olefins
A reaction between ethyl α-cyanocinnamate and o-phenylenediamine under thermal conditions yielded 2-cyano-3-phenyl-propionic acid ethyl ester, 2-phenyl benzimidazole, and ethyl cyanoacetate. The mechanistic revelations led to the development of a simple and efficient transfer-hydrogenation process from the in situ generated benzimidazolines to activated olefins under solventless and catalyst-free conditions. Georg Thieme Verlag Stuttgart.
Kumar, Satish,Kapoor, Kamal K.
p. 2809 - 2814
(2008/02/13)
Polymeric sulfonate of piperazine as an inexpensive and recyclable catalyst for Knoevenagel condensation
Polymeric sulfonate of piperazine (Amberlite 200 H/piperazine) has been found to be an inexpensive and reusable patalyst for Knoevenagel reaction between aldehydes and activated methylene compounds. The preparation and rejuvenation of the presented polyme
Wen, Xinmin
p. 762 - 765
(2007/10/03)
Use of a solid hydrotalcite structure incorporating fluorides for basic catalysis of michael or knoevenagel reactions
The invention concerns the use of a solid basic catalyst comprising a hydrotalcite structure wherein part at least of the compensating anions are fluoride anions F? for producing Knoevenagel of Michael condensation reactions. The invention also concerns novel solid basic catalysts comprising a hydrotalcite structure characterised by a Mg/Al molar ratio ranging between 2.5 and 3.8 wherein at least part of the compensating anions are fluoride anions F?, and methods for preparing said novel catalysts.
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Page/Page column 5
(2008/06/13)
A simple approach for the synthesis of 2,6-diaryl-4-oxo-3,4- dihydropyrimidine-5-carbonitriles
A concise, facile and straightforward synthesis of 2,6-diaryl-4-oxo-3,4- dihydropyrimidine-5-carbonitriles 12a-h is reported. The reaction for this preparation involves the condensation of ethyl α-cyanocinnamate and its para substituted analogs 8a-e with
Mendonca Jr., Francisco J. B.,Dos Anjos, Janaina V.,Falcao, Emerson P. S.,De Melo, Sebastiao J.,Srivastava, Rajendra M.
p. 479 - 484
(2007/10/03)
A novel multicomponent reaction involving isocyanide, dimethyl acetylenedicarboxylate (DMAD), and electrophilic styrenes: Facile synthesis of highly substituted cyclopentadienes
Alkyl isocyanides, DMAD, and various activated styrenes furnish fully substituted cyclopentadienes in a one-pot three-component reaction.
Microwave-enhanced Knoevenagel reaction catalyzed by calcium oxide
Calcium oxide is employed both as heterogeneous catalyst and dehydrating agent in microwave-induced Knoevenagel reaction and gives the corresponding arylidene compounds in good yields.
Peng, Yanqing,Song, Gonghua
p. 924 - 926
(2007/10/03)
Utilisation of 13C N.M.R. Spectroscopy for the Identification of E- and Z-α,β-Unsaturated Esters, Ketones and Nitriles.
Measurement of 3JCO,H coupling constants provides an unambiguous procedure for the configurational analysis of substituted 2- and 3-arylpropenoic esters and of E- and Z-2-arylbut-2-en-1,4-dioates, even when only one of the isomers is available for analysis.An analogous procedure can also be used for the configurational analysis of 3-arylpropenonitriles and of 4-arylbut-3-en-2-ones.
Gregory, Barrie,Hinz, Werner,Jones, R. Alan,Arques, Jose Sepulveda
p. 2801 - 2821
(2007/10/02)
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