Results 21 to 30 of about 127,650 (334)

Radical Fluoroalkylation Reactions [PDF]

, 2018
Recent protocols and reactions for catalytic radical perfluoroalkylations will be described. The production of perfluoroalkyl radicals (RF = CnF2n+1, n ≥ 2), which effect both addition and substitution reactions on organic substrates, can be realized ...
Barata Vallejo, Sebastian, Cooke, María Victoria, Postigo, A.   +2 more
core   +1 more source

Dipolar Cycloaddition Reactions with Quinazolinones: A New Route for the Synthesis of Several Annelated Pyrrolo- and Pyridazinoquinazoline Derivatives

Molecules, 2003
The novel 2-aryl-3a,4,12,12a-tetrahydropyrrolo[3',4':4,3]-pyridazino[6,1-b]-quinazoline-1,3,6-triones (6a–d), 2-aryl-10-oxopyridazino[6,1-b]-quinazoline-3-thio-carboxamides (10a–d) and 2-aryl-3-nitro-1,2,3,4-tetrahydro-pyridazino[6,1-b ...
Hatem M. Gaber, Sami S. Ghabrial
doaj   +1 more source

Redox-Neutral Photocatalytic C−H Carboxylation of Arenes and Styrenes with CO2

Chem, 2020
Summary Carbon dioxide (CO2) is an attractive one-carbon (C1) building block in terms of sustainability and abundance. However, its low reactivity limits applications in organic synthesis as typically high-energy reagents are required to drive ...
Matthias Schmalzbauer, Thomas D. Svejstrup, F. Fricke, P. Brandt, Magnus J. Johansson, G. Bergonzini, B. König   +6 more
semanticscholar   +1 more source

Scope and Mechanistic Study of the Coupling Reaction of α,β-Unsaturated Carbonyl Compounds with Alkenes: Uncovering Electronic Effects on Alkene Insertion vs Oxidative Coupling Pathways [PDF]

, 2012
The cationic ruthenium-hydride complex [(C6H6)(PCy3)(CO)RuH]+BF4– (1) was found to be a highly effective catalyst for the intermolecular conjugate addition of simple alkenes to α,β-unsaturated carbonyl compounds to give (Z)-selective tetrasubstituted ...
Ackermann L., Ackermann L., Ackermann L., Ackermann L., Anastas P. T., Anastas P. T., Anslyn E. V., Arai T., Beccalli E. M., Berlin J. M., Bernasconi C. F., Chae S. Yi, Colby D. A., Colby D. A., Cristau H.-J., Do W. Lee, Donohoe T. J., Engle K. M., Flynn A. B., Foley N. A., Frantz D. E., Gansäuer A., Gao H., Giri R., Giri R., Guo L.-N., Hartwig J. F., Ho C.-Y., Hojo D., Huang C., Isaacs N. S., Itami K., Jun C.-H., Kakiuchi F., Kakiuchi F., Kakiuchi F., Ki-Hyeok Kwon, Kwon K.-H., Kwon K.-H., Lee D. W., Lee D.-H., Lemay A. B., Liu L., Lu Y., Maryanoff B. E., Matsubara R., Matsuura Y., McKinley N. F., Negishi E., Ni Y., Ogoshi S., Oh H. K., Park S. H., Patureau F. W., Patureau F. W., Patureau F. W., Pintori D. G., Rakshit S., Rakshit S., Sato T., Sheldon R. A., Shen Y., Shi B.-F., Singleton D. A., Stenne B., Strohfeldt K., Stuart D. R., Stuart D. R., Stuart D. R., Su Y., Tang J.-M., Trost B. M., Tsai A. S., Ueyama T., Umeda N., Vorfalt T., Wang F., Wasa M., Wasa M., Weissman H., Weston M. H., Ye M., Yi C. S., Yi C. S., Yokota T., Yu M., Zhang Y.-H., Zhao C., Zhou C., Zhou C., Zhu C.   +90 more
core   +2 more sources

Formal [3+2] Cycloaddition Reactions of Electron-Rich Aryl Epoxides with Alkenes under Lewis Acid Catalysis Affording Tetrasubstituted Tetrahydrofurans [PDF]

, 2020
We report on the regio- and stereoselective synthesis of tetrahydrofurans by reaction between epoxides and alkenes in the presence of a Lewis acid. This is an unprecedented formal [3+2] cycloaddition reaction between an epoxide and an alkene.
Cuca-Suárez, Luís, González, Florenci, Macías-Villamizar, Víctor, Rodríguez, Santiago   +3 more
core   +1 more source

Titania-Catalyzed H₂O₂ Thermal Oxidation of Styrenes to Aldehydes

Molecules, 2019
We investigated the selective oxidation of styrenes to benzaldehydes by using a non-irradiated TiO2−H2O2 catalytic system. The oxidation promotes multi-step reactions from styrenes, including the cleavage of a C=C double bond and the addition of an
Satoru Ito, Yoshihiro Kon, Takuya Nakashima, Dachao Hong, Hideo Konno, Daisuke Ino, Kazuhiko Sato   +6 more
doaj   +1 more source

Additivity of Heats of Combustion, LCAO Resonance Energies, and Bond Orders of Conformal Sets of Conjugated Compounds [PDF]

, 1965
The notion of "conformal sets" of aromatic and other conjugated compounds is introduced. To a good approximation, it is found that the sum of the heats of combustion of the compounds in one set equals the sum for the compounds in the other set.
Marcus, R. A.
core   +1 more source

Hydroxy- and Hydro-Perfluoroalkylation of Styrenes by Controlling the Quenching Cycle of Eosin Y

Molecules, 2023
Fluoroalkyl compounds are widely used, underscoring a pressing need for the development of methods for their synthesis. However, reports on perfluoroalkylation to styrenes have been sparse.
Haruko Shibata, Moeko Nakayama, Koto Tagami, Tadashi Kanbara, Tomoko Yajima   +4 more
doaj   +1 more source

One-pot near-ambient temperature syntheses of aryl(difluoroenol) derivatives from trifluoroethanol [PDF]

, 2011
Difluoroalkenylzinc reagents prepared from 1-(2’-methoxy-ethoxymethoxy)-2,2,2-trifluoroethane and 1-(N,N-diethylcarbamoyloxy)-2,2,2-trifluoroethane at ice bath temperatures, underwent Negishi coupling with a range of aryl halides in a convenient one pot ...
Kyne, Sara H, Percy, Jonathan M, Pullin, Robert D C, Redmond, Joanna M, Wilson, Peter G   +4 more
core   +1 more source

Ketones from aldehydes via alkyl C(sp3)−H functionalization under photoredox cooperative NHC/palladium catalysis

Nature Communications, 2023
Direct synthesis of ketones from aldehydes features high atom- and step-economy. Yet, the coupling of aldehydes with unactivated alkyl C(sp3)-H remains challenging.
Hai-Ying Wang, Xin-Han Wang, Bang-An Zhou, Chun-Lin Zhang, Song Ye   +4 more
doaj   +1 more source