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Ring-opening polymerization of various cyclic esters by Al complex catalysts containing a series of phenoxy-imine ligands: Effect of the imino substituents for the catalytic activity by Naruhito Iwasa; Michiya Fujiki; Kotohiro Nomura is a Chemistry article available to read on EtoBox.

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Ring-opening polymerizations (ROPs) of various cyclic esters [-caprolactone (CL), ␦-valerolactone (VL), rac-lactide (LC)] using a series of Al complexes containing phenoxy-imine ligands of type, Me , have been explored in the presence of n BuOH. Synthesis and identification of 1g and 1h including structural analysis of 1g by X-ray crystallography have also been explored. Both the catalytic activity and the catalyst efficiency in the ROPs were found to be highly affected by the imino substituents (R) employed. The 2,4,6-t Bu 3 C 6 H 2 analogue (1h) showed the notable catalytic activity in spite of its low catalyst efficiency in the ROP of CL, and the C 6 F 5 analogue (1i) was most effective in terms of both the activity and the efficiency. The C 6 F 5 analogue (1i) also showed the highest catalytic activity for the ROP of VL, and the polymerization proceeded in a living manner. The C 6 F 5 analogue also showed relatively high catalytic activity in the ROP of LC, but the resultant polymer had no stereo-regularity. Although the Al complexes containing alkyl substituents (1a-c) exhibited low or negligible catalytic activities in the ROPs of CL and VL, the cyclohexyl analogue (1b) showe

Who reads Ring-opening polymerization of various cyclic esters by Al complex catalysts containing a series of phenoxy-imine ligands: Effect of the imino substituents for the catalytic activity?

Author

Naruhito Iwasa; Michiya Fujiki; Kotohiro Nomura

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1381-1169)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)