Rhodium and ruthenium complexes of methylene-bridged, -stereogenic, unsymmetrical diphosphanes.

Enantiopure -stereogenic methylphosphane-boranes ()-P(BH)PhArMe (; Ar = 1-naphthyl (NpMe), and 2-biphenylyl (BiphMe)) have been used to prepare diphosphanes of the type ArPhPCHPR (R = Ph, iPr or Bu; ). The ligands have been reacted with [Rh(COD)]BF to furnish the corresponding six monochelated [Rh(COD)()]BF organometallic compounds (RhArR) or, depending on the reaction conditions, the bis(chelated) coordination compound [Rh()]BF as a mixture of and isomers. The crystal structure of -[Rh()]BF was obtained.

Membrane Dialysis for Partial Dealcoholization of White Wines.

Membrane dialysis is studied as a promising technique for partial dealcoholization of white wines. The performance of three membrane processes applied for the partial dealcoholization of white wines of the Verdejo variety has been studied in the present work. Combination of Nanofiltration with Pervaporation, single step Pervaporation and, finally, Dialysis, have been applied to white wines from same variety and different vintages.