A new synthesis of cyclic allenic esters

…, R Israel, F Totino, P Williamsen

Index: Silveira, Augustine; Angelastro, Michael; Israel, Robert; Totino, Frank; Williamsen, Peter Journal of Organic Chemistry, 1980 , vol. 45, # 17 p. 3522 - 3523

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Citation Number: 11

Abstract

Previous studies2p3 have demonstrated the generality of the conversion of 3, 4- polymethylene-2-pyrazolin-5-ones to cycloalkene-l-carboxylic acids in two steps: first by conversion to the 4-halo-3, 4-polymethylene-2-pyrazolin-Bone and then by a ring-opening reaction with aqueous sodium hydroxide. In related work, Taylor's group4 has converted 3, 4- dialkyl-2-pyrazolin-5-ones directly to acyclic allenic esters using thallium (II1) nitrate and ...