A water-soluble phosphite derived from sulfonated calix[4]arene. The remarkable stability of its rhodium complexes and two phase hydroformylation studies

摘要: The reaction of tetrasulfonated calix[4]arene (trioctylammonium salt) with P(NMe2)3 followed by treatment gaseous NMe2H gave a zwitterionic six-coordinate phosphorus(V) species 1 containing P(H)(NHMe2) group which can be stored for months without decomposition. In water, loses NHMe2 and rearranges to form the water soluble phosphite Lcc. Phosphite Lcc has half-life in ca. 5 h decomposing H3PO3 free calix[4]arene. Compound serves as convenient precursor complexes are formed dissolving presence labile metal complexes. products have been identified comparison their 31P NMR data well established analogues derived phosphites. this way [Rh(acac)(CO)(Lcc)2] (2c) [Rh2Cl2(CO)2(Lcc)2] (3c), [Pt2Cl4(Lcc)2] (4c) [PtCl2(Lcc)2] tentatively identified. rhodium complex 3c 4 months. Two-phase (water/toluene) hydroformylation 2-methylpentenoate 2c catalyst investigated results compared same toluene lipophilic 2c. Under mild conditions, 2ccatalyst, branched aldehydes only one is selectively hydrogenated give lactone derivative.