Mechanistic insight into initiation and regioselectivity in the copolymerization of epoxides and anhydrides by Al complexes†
Yanay
Popowski, 
a
Juan J.
Moreno,
b
Asa W.
Nichols,
b
Shelby L.
Hooe,
b
Caitlin J.
Bouchey,
ac
Nigam P.
Rath,
d
Charles W.
Machan
*b
and
William B.
Tolman
*a
a
Juan J.
Moreno,
b
Asa W.
Nichols,
b
Shelby L.
Hooe,
b
Caitlin J.
Bouchey,
ac
Nigam P.
Rath,
d
Charles W.
Machan
*b
and
William B.
Tolman
*a
Abstract
Pentacoordinate Al catalysts comprising bipyridine (bpy) and phenanthroline (phen) backbones were synthesized and their catalytic activity in epoxide/anhydride copolymerization was investigated and compared to (t-Busalph)AlCl. Stoichiometric reactions of tricyclic anhydrides with Al alkoxide complexes produced ring-opened products that were characterized by NMR spectroscopy, mass spectrometry, and X-ray crystallography, revealing key regio- and stereochemical aspects.
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