64198-89-6Relevant academic research and scientific papers
Pyrene-Connected Tetraimidazolylidene Complexes of Iridium and Rhodium. Structural Features and Catalytic Applications
Gutiérrez-Blanco, Ana,Peris, Eduardo,Poyatos, Macarena
, p. 4070 - 4076 (2018/11/23)
A pyrene-connected tetra-imidazolium salt has been prepared starting from commercially available 1,3,6,8-tetrabromopyrene, and used as tetra-NHC precursor in the preparation of tetranuclear Rh(I) and Ir(I) complexes. The tetra-NHC ligand displays axial ch
Synthesis and Rearrangement of Alkylaryl- and Aryl-substituted Dihydrosemibullvalenes by Thermolysis of 7,8-Fused Cyclo-octa-1,3,5-triene Derivatives
Greenfield, Simon,Mackenzie, Kenneth
, p. 1651 - 1666 (2007/10/02)
The thermal cycloaddition of a cyclobuteno-dienophile (1) with cyclopentadienones has been systematically investigated; the stereoisomeric adducts give convenient access by decarbonylation to a variety of tetra-aryl, methyltriphenyl-, triphenyl-, tri-t-butyl-, and dimethyldiphenyl-cyclo-octa-1,3,5-triene derivatives as the products of electrocyclic ring-opening of the valence-tautomeric primary products of cheletropic bridge-extrusion, viz. bicyclooctadienes.These compounds provide useful models for investigation of equilibria between the electrocyclic valence tautomers, the scope and mechanism for thermal cross-cyclisations in, for example, unsymmetrically substituted cyclooctatrienes, and the thermal vinyl-cyclopropane (1,3-allylic shift) isomerisation and/or H-atom transfer disproportionation of the resulting arylated and alkylaryldihydrosemibullvalenes.The results best accord with diradical pathways for cyclo-octatriene-dihydrosemibullvalene conversions and subsequent rearrangements.Usefull 13C and 1H n.m.r. structure correlations and new examples of cyclopentadienones are also reported.
Reactions with Allylidenephosphoranes, IV. An Easy Synthesis of Cyclopentadienones (Cyclones)
Capuano, Lilly,Triesch, Thea,Schramm, Volker,Hiller, Wolfgang
, p. 2785 - 2789 (2007/10/02)
The Allylidenephosphoranes 2 react with α-ketocarbonyl chlorides 3 readily to afford the cyclopentadienones 4 and their Diels-Alder dimers 5.With an excess of 2a, 4a undergoes competitive Michael additions yielding a mixture of 4-allylidene-2-cyclopenteno
