Review of Calixarene-Derivatives in Transition Metal Chemistry

The survey depicts the combination of large-scale monodentate phosphites in response to PCl3/NEt3 with p-tert-butyl calix[4]-(OH)3-OR, where R contains an oxygen-containing substituent (R = CH2P(O)Ph2, -CH2CO2Et, -CH2C(O)NEt2, -CH2CH2OMe). These funnel-shaped calissarenes have a phosphorus particle bridging three phenolic oxygen atoms, and are incredibly steady NaOH-aqueous arrangement due cone point being more noteworthy than 180°. Upon transition metal particles, these shape either P complexes or expansive P,O chelate including atom group. reactivity four different ligands rhodium-catalyzed hydroformylation octene was examined. general trend is that bulkier phosphite ligand leads slower reaction rate. ligand-to-base ratios ranged from 1.4 3.6, highest straight aldehyde selectivity observed when carboxylate group CH2CO2Et.