The first efficient solid-phase synthetic approach towards diphosphine ligands is demonstrated. This modular method offers facile access to a class of ligands providing huge potential for ligand fine-tuning.
We report on the characterization of silica aerogel thermal optical nonlinearity, obtained by z-scan technique. The results show that typical silica aerogels have nonlinear optical coefficient similar to that of glass (similar or equal to 10 (-12) m(2) /W), with negligible optical nonlinear absorption. The nonlinear coefficient can be increased to values in the range of 10 (-10) m(2) /W by embedding an absorbing dye in the aerogel. This value is one order of magnitude higher than that observed in the pure dye and in typical highly nonlinear materials like liquid crystals. Published by AIP Publishing
An efficient modular method towards the synthesis of a library of polystyrene supported diphosphine ligands by combining solid-phase synthesis with rational ligand design has been developed. These supported ligands, obtained in quantitative yield, were efficiently and effectively screened in Rh-catalysed asymmetric hydrogenation of several benchmark substrates.
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