858135-00-9Relevant academic research and scientific papers
Synthesis and characterization of metallodendritic palladium-biscarbene complexes derived from 1,1′-methylenebis(1,2,4-triazole)
Hornillos, Valentin,Guerra, Javier,De Cozar, Abel,Prieto, Pilar,Merino, Sonia,Maestro, Miguel A.,Diez-Barra, Enrique,Tejeda, Juan
, p. 4095 - 4103 (2011)
The syntheses of first generation dendritic compounds bearing 1,1′-alkane-1,1-diylbis(4-butyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene) palladium(ii) dibromide on the periphery are described. The metallabiscarbene moieties have also been studied separately from the dendrimer. These compounds display a non-symmetric boat-to-boat conformational equilibrium that has axial and equatorial arrangements. The predominance of the axial conformer in the equilibrium is supported by DFT calculations. The X-ray solid state structures of axial conformers of 3-hydroxy- and 3-mesyloxy-1,1′-propane-1,1- diylbis(4-butyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene)palladium(ii) dibromide are reported. These complexes display modest catalytic activity in the Heck reaction with activated aryl bromides and the dendritic catalysts were more active than the corresponding non-dendritic mononuclear species, a finding indicative of a cooperative effect.
