{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,10]],"date-time":"2025-12-10T08:28:55Z","timestamp":1765355335246,"version":"3.40.5"},"reference-count":21,"publisher":"American Chemical Society (ACS)","issue":"21","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Org. 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Chem."},{"key":"ol0618609b00011\/ol0618609b00011_1","first-page":"9718","volume":"59","author":"Luisi R.","year":"2003","journal-title":"Tetrahedron"},{"key":"ol0618609b00012\/ol0618609b00012_1","unstructured":"13C NMR data give strong evidence of such an equilibration between4and5occurring in CDCl3as well as in THF-d8; indeed,13C resonances at 111\u2212113 ppm and at ca. 164 ppm are diagnostic of two spirocyclic carbon atoms and of an oxazoline CN group, respectively. On the other hand, in the solid state, only the spirocyclic skeleton of4was detected by means of an IR investigation (KBr); indeed, a diagnostic NH stretching band appeared at ca. 3360 cm-1, whereas no oxazoline CN bond stretching was observed at ca. 1668 cm-1which is the typical stretching frequency."},{"volume-title":"spirocyclic compounds 4 are the main forms present in freshly prepared CDCl3 solution, as checked by 1H NMR","author":"In","key":"ol0618609b00013\/ol0618609b00013_1"},{"key":"ol0618609b00019\/ol0618609b00019_1","first-page":"4232","volume":"2","author":"For","year":"2000","journal-title":"J. Org. Lett."},{"key":"ol0618609b00021\/ol0618609b00021_1","first-page":"1876","volume":"65","author":"Hamann H.-Y.","year":"2000","journal-title":"J. Org. 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