A NEW REACTION OF CYCLIC ALIPHATIC ANHYDRIDES

Alternating copolymerization of epoxides and cyclic anhydrides: an improved route to aliphatic polyesters.

Aliphatic polyesters constitute an important class of polymers because of their biodegradability1,2 and biocompatability,2,3 which enable their use in drug delivery systems,2 artificial tissues,3 and commodity materials.4 Polyesters such as poly(butylene succinate) are commonly produced through condensation polymerization; however, this method is energy intensive, requiring high temperature and...

Cyclic Oligophosphonic Anhydrides Stable in Aqueous Media

Depending on reaction conditions, the phosphonylation of N-alkylacetamides with H3PO3-P C I3 in B-HC1 media (B = Py, Bu3N) gives either l-alkylaminoethylidene-l,l-bisphosphonic acids (la—e) or previously unknown l-alkylaminobutane-l,l,3,3-tetrayl-tetrakisphosphonic dianhydrides (2a-e). The latter convert into monocyclic forms (3a-e) under mild acidic hydrolysis. Acyclic forms (4a-e) cannot be i...

Reaction of periodic acid on the difructose anhydrides.

Diheterolevulosan, difructose anhydrides I. III, and II react, respectively, with 4, 2, 1, and 1 moles of periodic acid per mole of sugar. These results are in keeping with the known structures of the first three sugars. It is suggested that difructose anhydride II is a 1,2' -2,4'-difructofuranose. CONTENTS Page

Synthesis of fatty acid anhydrides by reaction with dicyclohexylcarbodiimide.

A simple method is described for the preparation of caprylic, palmitic, stearic, and oleic anhydrides. Reaction of the free fatty acid and dicyclohexylcarbodiimide in carbon tetrachloride at room temperature gives the corresponding anhydrides in high yield (87-94%).

Highly enantioselective catalytic thiolysis of prochiral cyclic dicarboxylic anhydrides utilizing a bifunctional chiral sulfonamide.