Organoplatinum(IV) tris-chelate complexes, each having a cyclic metallacarbonate ring: synthesis, characterization and kinetic studies of the formation.
The complexes [Pt[(CH2)4](NN)], 1a (NN = 2,2'-bipyridine) and 1b (NN = 1,10-phenanthroline) react with 2,3-epoxypropylphenyl ether in the presence of CO2 to give tris-chelate platina(IV)cyclopentane complexes characterized by 1H and 13C NMR spectroscopy as [Pt[(CH2)4](CH2CHCH2OPhOCO2)(NN)], 2. The reactions proceed by the SN2 mechanism and the rates were independent of concentration of CO2. It is demonstrated that for 1a, the reaction proceeds 2.32 times faster than the similar reaction in which the dimethyl analog, [PtMe2(2,2'-bipyridine)], is used. The analog tris-chelate complex [Pt[(CH2)4](CH2CHPhOCO2)(phen)], 3a, was similarly synthesized.
Rashidi
Mehdi
M
Chemistry Department, College of Sciences, Shiraz University, Shiraz 71454, Iran. rashidi@chem.susc.ac.ir
Shahabadi
Nahid
N
Nabavizadeh
S Masoud
SM
D002254:Carbonates / Q000737:chemistry*; D002614:Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry; D003500:Cyclization; D007700:Kinetics; D008968:Molecular Conformation; D009944:Organoplatinum Compounds / Q000138:chemical synthesis / Q000737:chemistry; D013696:Temperature
D002254:Carbonates; D002614:Chelating Agents; D009944:Organoplatinum Compounds