K. Hashimoto, Ken-ichi Mori, M. Okada
May 1, 1992
Citations
0
Influential Citations
14
Citations
Journal
Macromolecules
Abstract
A new optically active bicyclic lactam, (1S,4S,5R)-4-(benzyloxy)-8-oxa-6-azabicyclo[3.2.1]oct-2-en-7-one (2), was synthesized from n-glucuronic acid. Anionic ring-opening polymerization of 2 proceeded at -60 to +25 o C in various solvents to give acetone-insoluble polymers. The polymer precipitated from the THF solution during the polymerization at -40°C was found to have a repeatingunit containing a 5,6-dihydro-2H-pyran ring (3) and that obtained in the DMF homogeneous solution to have another unit with a 5,6-dihydro-4H-pyran ring which was isomerized from 3