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- [5] SPIRO PIPERIDINES .1. SYNTHESIS OF SPIRO[ISOBENZOFURAN-(3H),4'-PIPERIDIN]-3-ONES, SPIRO[ISOBENZOFURAN-1(3H),4'-PIPERIDINES], AND SPIRO[ISOBENZOTETRAHYDROTHIOPHENE-1(3H),4'-PIPERIDINES] JOURNAL OF ORGANIC CHEMISTRY, 1976, 41 (15): : 2628 - 2633