Palladium-catalyzed tandem cyclization of 4, 6-and 5, 7-diene amides. A new route toward the pyrrolizidine and indolizidine alkaloids

PG Andersson, JE Baeckvall

Index: Andersson, Pher G.; Baeckvall, Jan-E. Journal of the American Chemical Society, 1992 , vol. 114, # 22 p. 8696 - 8698

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Citation Number: 75

Abstract

Conclusions With large basis sets and high-level theoretical methods, the structure and physical properties of the exocyclic ring isomer of diacetylene, cyclopropenylidenecarbene (: C= CC2H2), are predicted. Several of the vibrational frequencies appear to have IR intensities strong enough for detection. Moreover, cyclopropenylidenearbene has a large dipole moment, raising the hope that experimental and astronomical investigations will ...