Phosphanorbornadienephosphonates as a New Type of Water-Soluble Phosphines for Biphasic Catalysis
摘要:
The reaction of (phenylethynyl)phosphonates or- phosphonamides with 1-phenyl-3,4-dimethylphosphole at 140 degrees C affords the corresponding alpha-P(O)-substituted 1-phosphanorbornadienes (1-3). The corresponding PO3Na2 salt (5) displays some solubility in water (20 g/L) but is a poor ligand both for the rhodium-catalyzed hydrogenation and hydroformylation of olefinic bonds. The reaction of an unsubstituted ethynylphosphonamide with the same phosphole yields a 3:1 mixture of alpha- and beta-P(O)-substituted 1-phosphanorbornadienes 7 and 8. The beta-PO3Na2 salt (10) is a good ligand for the hydrogenation of (Z)-alpha-(N-acetamido)cinnamic acid and displays a high solubility in water (230 g/L). The chelation of rhodium by the alpha-P(O)-substituted 1-phosphanorbornadienes probably explains the loss of hydrogenation efficiency for [RhL(2)](+) when L = 5.
Process for the partial hydrogenation of fatty acid esters
申请人:Papadogianakis Georgios
公开号:US20100022664A1
公开(公告)日:2010-01-28
Suggested is a process for the manufacture of unsaturated fatty acid alkyl esters or glycerides having a total content of C 18:1 of about 30 to about 80 Mol-% by partial hydrogenation of unsaturated fatty acid esters having a total content of (C18:2+C18:3) of at least 65 Mol-%—calculated on the total amount of C18 moieties in the ester—which is characterised in that the hydrogenation is conducted in an aqueous/organic two phase system in the presence of a water soluble catalyst consisting of a Group VIII metal and a hydrophilic ligand.