X-RAY CRYSTALLOGRAPHIC STUDY OF BOROXAZOLIDONES OBTAINED FROM L-ORNITHINE, L-METHIONINE, KAINIC ACID AND 2,6-PYRIDINEDICARBOXYLIC ACID

In the present contribution, the boroxazolidones prepared from L-ornit hine, L-methionine, kainic acid and 2,6-pyridinedicarboxylic acid have been studied by X-ray crystallography. A comparison of the structural data with corresponding boroxazolidines, bicyclic boronates and tricy clic berates has shown that in boron complexes with a boroxazolidone r ing the B-O bond is longer in comparison to boron complexes with a bor oxazolidine ring. At the same time the N-->B bond length is shorter in dicating that the hydrolytic stability of the complexes with boroxazol idone rings is enhanced. (C) 1998 Elsevier Science S.A. All rights res erved.