Related Products of 103-74-2In 2017 ,《Mechanism and Stereocontrol in Isotactic rac-Lactide Polymerization with Copper(II) Complexes》 appeared in ACS Catalysis. The author of the article were Daneshmand, Pargol; van der Est, Art; Schaper, Frank. The article conveys some information:
Reaction of N-R,N’-R’-2,5-diiminopyrroles (R = R’ = S-CH(Me)Ph; R = R’ = CH2Ph; R = S-CH(Me)Ph, R’ = H) with Cu(OMe)2 in the presence of chelating alcs., ROH (R1 = C2H4NMe2, R2 = C2H4Py, R3 = CH2Py, R4 = CMe2Py) yielded the dinuclear, alkoxide-bridged complexes L2Cu2(OR)2. The complexes catalyze the polymerization of rac-lactide at room temperature with catalyst concentrations of 1-3 mM in 4-24 h (v = k[cat][monomer] with k = [2.3(5)] × 102 – [6.5(6)] × 102 M-1 h-1). EPR and mechanistic studies indicate that the complexes remain dinuclear during the polymerization reaction. In complexes with OR1, both alkoxides of the dimer initiate polymerization, with OR2 or OR3 only one alkoxide initiates polymerization, and OR4 is inactive in polymerization The nature of the bridging ligand in the dinuclear complex determines stereocontrol. Independent of the spectator ligand L, complexes which retain an OR3 or OR4 bridging ligand in the active species show preference for isotactic polymerizations (Pm = 0.60-0.75), while those with only polymeryloxo bridges or OR2 as the bridging ligand provide atactic polymer. Stereocontrol follows a chain-end control mechanism, with the catalytic site likely adapting to the configuration of the chain end. In the part of experimental materials, we found many familiar compounds, such as 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Related Products of 103-74-2)
2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Related Products of 103-74-2