Abstract
New pyridinyl SN-bi- (1) and SNS-tridentate (3) ligands were obtained by hydrothiolation of substituted alkenes with thioacetic acid. A number of these, as well as the known SN- (2) and SNO- (4, 5) ligands were used in the synthesis of methylaluminum complexes. Molecular structure of the monoligand, [2,6-MePy(CH2CMe2S)]AlMe2 (1a), [2,6-MePy(CH2CH2CMe2S)]AlMe2 (2a), [2,6-Py(CH2CMe2S)2AlMe] (3a) and [2,6-Py(CH2CH2CMe2SH)(CH2CH2CMe2O)AlMe2]2 (5a), and the diligand, [2,6-MePy(CH2CMe2S)]2AlMe (1b), complexes were studied in solution (NMR spectroscopy) and in crystal (1a, XRD); the dependence between the ligand and the complex structure formed was established. The catalytic activity of 1-3a, 5a and 1b in the ring-opening polymerization of ε-caprolactone was studied in bulk, indicating high control of the process.
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