155204-13-0Relevant academic research and scientific papers
Palladium-catalyzed allylic alkylation of simple ketones with allylic alcohols and its mechanistic study
Huo, Xiaohong,Yang, Guoqiang,Liu, Delong,Liu, Yangang,Gridnev, Ilya D.,Zhang, Wanbin
supporting information, p. 6776 - 6780 (2014/07/08)
Allylic alcohols were directly used in Pd-catalyzed allylic alkylations of simple ketones under mild reaction conditions. The reaction proceeded smoothly at 20°C by the concerted action of a Pd catalyst, a pyrrolidine co-catalyst, and a hydrogen-bonding solvent, and does not require any additional reagents. A computational study suggested that methanol plays a crucial role in the formation of the π-allylpalladium complex by lowering the activation barrier. Concerted action: Allylic alcohols were directly used in the title reaction under mild conditions. The reaction smoothly proceeds by the concerted action of a Pd catalyst, a pyrrolidine co-catalyst, and a hydrogen-bonding solvent, and does not require any additional reagents. A computational study suggested that methanol plays a crucial role in the formation of the π-allylpalladium complex by lowering the activation barrier.
Perturbation of the degenerate, concerted cope rearrangement by two phenyl groups in "active" positions of (E)-1,4-diphenylhexa-1,5-diene. Acceleration by high pressure as criterion of cyclic transition states
Doering,Birladeanu, Ludmila,Sarma, Keshab,Teles, Joaquim Henrique,Kl?rner,Gehrke, Jan-Stephan
, p. 4289 - 4297 (2007/10/02)
Previous examinations of radical-stabilizing substituents in the two distinct types of position in the hypothetical "aromatic" transition state of the thermal Cope rearrangement, designated "a" or active and "n" or nodal after the allyl radical have concentrated on their effect in the "n" positions. In order to provide a quantitatively reliable reference for the "a" position, the activation parameters of the degenerate rearrangement of (6-13C)-1,4-diphenylhexa-1,5-diene have been evaluated: Ea = 30.8 ± 0.4 kcal/mol; log A = 10.14 ± 0.2. The soundly energetically-based proposition that these observations relate to a concerted mechanism is strongly supported by the observation of a 3.0-fold increase in rate of approach to equilibrium on increasing the pressure from 1 bar to 6000 bar (162°C; benzene-d6). This rearrangement like that of cis-1,2-divinylcyclobutane and rac- and meso-3,4-diphenylhexa-1,5-diene, has a negative volume of activation. In contrast, trans-1,2-divinylcyclobutane, which does not rearrange by a cyclic transition state and gives cycloocta-1,5-diene, 4-vinylcyclohexene, and butadiene as products, has a positive volume of activation. To place the possibility of reaction by the homolytic/colligative (dissociative/recombinative) mechanism on a "quantitative" base, a further sighting on the heat of formation of the cinnamyl radical is provided by activation parameters for thermal syn-anti equilibration between (E)- and (Z)-1,1′-bi-3-phenylcyclohex-2-enylidene: Ea = 35.8 ± 0.2 kcal/mol; log A = 12.7 ± 0.1. After correction for conjugative interaction between phenyl and the double bond in the educts and without regard for any proposed structure for the transition state, the two phenyl groups in "a" positions appear to have lowered the enthalpy of activation by 7.7 kcal/mol relative to the paradigm, hexa-1,5-diene, whereas the two phenyl groups in the "n" positions of 3,5-diphenylhexa-1,5-diene have lowered the enthalpy of activation by 17.0 kcal/mol.
Palladium(0)-Catalyzed Rearrangement of N-Allylenamines. Synthesis of δ,ε-Unsaturated Imines and γ,δ-Unsaturated Carbonyl Compounds
Murahashi, Shun-Ichi,Makabe, Yoshiki,Kunita, Kazuto
, p. 4489 - 4495 (2007/10/02)
Palladium-catalyzed rearrangement of N-allylenamines proceeds readily in the presence of a catalytic amount of trifluoroacetic acid to give δ,ε-unsaturated imines.Conveniently, δ,ε-unsaturated imines can be prepared directly by the reaction of allylamines with carbonyl compounds under the same conditions highly efficiently.The reaction involves oxidative addition of Pd(0) species to allylenammonium salts to give ?-allylpalladium complexes, which undergo intramolecular nucleophilic reaction with enamines give imines.The δ,ε-unsaturated imines are versatile synthetic precursors such as γ,δ-unsaturated carbonyl compounds.Synthetic applications are also described.
