A Convenient Synthesis of Spiro[4-n] dione and 2,2-Disubstituted Cyclopentane-1,3-dione System

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• The remaining products of entry 2,5 and 6 were characterized by getting satisfactory IR, 1H-NMR, 13C-NMR and mass spectra and comparing the salient features of these spectra with reported information.7
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