Several cases of pyridazino[4,5-d][1,3]Oxazine have been reported, but data on their structures are limited. For 2-phenylpyridazino[4.5-d][1,3]oxazin-4-one, only IR and UV data are available. For 4-amino-2.3-dihydro-(7H) pyridazino[4.5-d][1.3]oxazin, a 1H-RGM spectrum is reported. Complete 1H-1MR data, including Eu (fod)3-induced chemical shifts, were obtained to determine mitosane configuration (105) –112. 1H 1H data for saturated annular systems, as recorded in the original documents, do not provide fine structural information and provide only an approximate indication of chemical proton movements and are therefore not included. Only spectroscopic data are reported. No work on structural methods has been published. 1H NMR and IR data are available in CHEC-I and no new structural information has been found. The spectroscopic data available in the literature are mentioned in the respective chapters. 1H data from the NMR confirmed the geometry α of the Zr (IV) vessel base complexes, the salicylaldehydes derivatives and (R), (S) or rac-α -methyl-benzyle amines NMR.84 The extension of signals in 1HR NMR spectra showed the presence of a dynamic process in the NMR-1 solution. At low temperatures, the signals attributed to diasterateemes were divided.
Based on the stereochemistry of the Zr complex (IV), derived from salicyldehyde and solid-state amine(R), the main dihredro was classified as A (R,R). For the complex, which is a derivative of racamine, the 1H NMR spectra showed additional resonances; Additional resonances were observed, with the exception of two signals corresponding to large and small diasteric phenomena. These resonances have been attributed to the two additional diasterers from the complex, which includes a ligand R and a ligand S: -(R,S)/-(S,R) and s (S,R)/-(R,S). The results suggest a low chiral induction from ligain to metal. The 1H 1NMR data refers to at least one ring saturated with five heads. The following compounds were subject to a detailed 1H spectroscopy examination of the. The structures of several pyrrolo 9-amino-9H[1,2-a]Indole, (113) – (118), 9-imino-pyrrolo [1.2-a]indoles, (119) – (125) and pyrroloindolones, (126) (127) – were clearly established by 1H NMR, 13C NMR and IR-Specroscop 85TL2305. In addition, J clutch constants (13C-13C) have been studied to ensure that the carbon-carbon sequence is indicated in (127).
Our tutors have assessed the difficulty of the structure which is in agreement with these 1H NMR and 13C NM… That is a big difficulty.