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Organoaluminium complexes of ortho-, meta-, para-anisidines: synthesis, structural studies and ROP of ε-caprolactone (and rac-lactide)†
Yuanzhuo Li,Ke-Qing Zhao,Mark R. J. Elsegood,Timothy J. Prior,Xinsen Sun,Shanyan Mo
Catalysis Science & Technology Pub Date : 05/20/2014 00:00:00 , DOI:10.1039/C4CY00624K
Abstract

Reaction of Me3Al (two equivalents) with ortho-, meta- or para-anisidine, (OMe)(NH2)C6H4, affords the complexes {[1,2-(OMe),NC6H4(μ-Me2Al)](μ-Me2Al)}2 (1), [1,3-(Me3AlOMe),NHC6H4(μ-Me2Al)]2 (2) or [1,4-(Me3AlOMe),NHC6H4(μ-Me2Al)]2 (3), respectively. The molecular structures of 1–3 have been determined and all three complexes were found to be highly active for the ring opening polymerization (ROP) of ε-caprolactone. 1 was found highly active either with or without benzyl alcohol present; at various temperatures, the activity order 1 > 23 was observed. For the ROP of rac-lactide results for 1–3 were poor.

Graphical abstract: Organoaluminium complexes of ortho-, meta-, para-anisidines: synthesis, structural studies and ROP of ε-caprolactone (and rac-lactide)
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