69321-77-3Relevant academic research and scientific papers
Cobalt catalysis at the crossroads: cobalt-catalyzed alder-ene reaction versus [2 + 2] cycloaddition
Hilt, Gerhard,Paul, Anna,Treutwein, Jonas
supporting information; experimental part, p. 1536 - 1539 (2010/06/19)
(Figure Presented) The application of bidentate phosphine ligands in cobalt-catalyzed transformations of cyclic alkenes such as cyclopentene and cycloheptene with internal alkynes led to a chemoselective Alder-ene or a [2 + 2] cycloaddition reaction depending on the electronic nature of the alkyne and the bite angle of the ligand used.
SURFACE PHOTOCHEMISTRY: A "SYMMETRY FORBIDDEN" SIGMATROPIC HYDROGEN SHIFT MEDIATED BY CdS.
Mayo, Paul de,Wenska, Grazyna
, p. 1661 - 1670 (2007/10/02)
Excitation of CdS in the absence of oxygen in the presence of cyclic derivatives of diphenylcyclobutene gave the cation radical of the latter which underwent a reversible double bond migration.The structures of the products were established on the basis of spectral data ((1)H, (13)C NMR, MS, UV).Tests were performed to show that the reaction proceeds, at least in part, intramolecularly, and, therefore, represents the first example of a suprafacial sigmatropic hydrogen shift via a radical cation.This suprafacial pathway is symmetry forbidden in closed shell systems.Oxidation products were isolated when the irradiation was performed in an aerated system.The use of excited 9,10-dicyanoanthracene as an electron acceptor did not lead to the expected products; instead the sensitizer was consumed and two thermally unstable products were isolated.Their formation could be quenched by 1,2,4-trimethoxybenzene.
