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17O NMR spectra were recorded for several series of anhydrides (.The 17O NMR data were found to be sensitive to ring size and conformation.Substituent effects on a series of maleic anhydrides could be rationalized in terms of electronic effects.In contrast, the 17O NMR data for polycyclic succinic anhydrides showed that the chemical shifts of the carbonyl oxygens were roughly constant, while those of the central oxygens were sensitive to structure.The 17O NMR data for homophthalic anhydride were consistent with those for 2 and 27; the data for pyridine-2,3-dicarboxylic anhydride could be rationalized in terms of electronic effects, and those for 3,4-dihydronaphthalene-1,2-dicarboxylic anhydride were explained by compressional and electronic effects.

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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem