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All total 78 Articles be found
All total 78 Articles be foundPolyfunctionalized Cage Compounds by Pericyclic Domino Processes of 4,5-Dicyanopyridazine with Dienes: Applications and Limits
Giomi, Donatella,Nesi, Rodolfo,Turchi, Stefania,Mura, Elena
, p. 360 - 364 (2000)
The title compound 1 was found to behave as an attractive masked bis-diene to give 4-oxatricyclo-[4.3.1.03,7]dec-8-ene, 5-aza- and 5-silatricyclo[5.3.1.03,8]undec-9-ene, tricyclo[3.2.1.02,7]oct-3-ene, and tricyclo[5.3.1.03,8]undec-9-ene derivatives through purely pericyclic, three-step homodomino processes with diverse bis-dienophiles; whereas the reaction with myrcene (21) was characterized by a complete sitoselectivity affording compound 25, treatment of 1 with (R)-(-)-β-citronellene (26a) gave a 3:1 mixture of the homochiral diastereomers 30a and 31a. Some limits of this methodology, mainly arising from competitive side reactions upon the key cyclohexa-1,3-diene intermediates, are emphasized. The structures of the new compounds were established on the basis of spectral data.
Switchable activity of a Ru catalyst bearing an annulated mesoionic carbene ligand for oxidation of primary amines
Bera, Jitendra K.,Din Reshi, Noor U,Pal, Nilay Kumar,Pal, Saikat,Pal, Sourav,Yadav, Suman
, (2022/01/31)
The catalytic activity of a Ru complex 1, bearing a fused π-conjugated imidazo[1,2–a][1,8]naphthyridine-based mesoionic carbene (MIC) ligand, is examined for the oxidation of primary amines. Complex 1 affords nitrile or imine depending on the nature of th
An overview on the progress and development on the palladium catalyzed direct cyanation
Heydari, Somayyeh,Habibi, Davood,Reza Faraji, Ali,keypour, Hassan,Mahmoudabadi, Masoumeh
, (2020/10/02)
Generation of the positive CN ion and the corresponding direct cyanation are both extremely important for cyanation of aromatic compounds. Hereby, we would like to report the simultaneous use of the new Pd nano-catalyst as well as the three types of the N-arylsulfonyl cyanamides (A, B and C) as potent reagents for the in situ generation of the positive CN ion for the direct cyanation of phenylboronic acids in acetonitrile at reflux conditions.
A Versatile VMPO Catalyst Prepared In Situ for Oxidative Ammonolysis of Isomeric Picolines and Xylenes
Dutta, P.,Pathak, D. D.,Senapati, Rabinarayan
, p. 292 - 298 (2020/04/17)
Abstract: The V2O5–MoO3–P2O5 (VMPO) catalyst has been prepared in situ by thermal decomposition of vanado-molybdophosphoric acid (PMoV) on TiO2 support at 475°C. The TiO2 supported VMPO catalysts are characterized by FT–IR, XRD, BET surface area, NH3–TPD, and H2–TPR. Morphology of the catalyst has been studied by TEM. The accumulated data indicate decomposition of PMoV and presence of phosphate and pyrophosphate phases of molybdenum and vanadium after calcination. TPD and TPR studies exhibit the moderate acidity and presence of V4+ in the material, respectively. The VMPO catalyst has been used for ammoxidation of six different compounds including three isomeric picolines and three isomeric xylenes to the corresponding nitriles with the yield of 90–96%.
