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- [8] SYNTHESIS AND CHEMISTRY OF AZOLENINES .16. PREPARATION OF BOTH 3H-PYRROLES AND 2H-PYRROLES FROM 2,2-DISUBSTITUTED 1,4-DIKETONES VIA THE PAAL-KNORR REACTION, AND ISOLATION OF INTERMEDIATE 2-HYDROXY-3,4-DIHYDRO-2H-PYRROLES JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1990, (03): : 457 - 468