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Title: Theoretical study of alkali metal pyrrolides in comparison with nH-pyrrole
Authors: Somers, KRF
Ceulemans, A.
Issue Date: 2003
Source: JOURNAL OF PHYSICAL CHEMISTRY A, 107(28). p. 5427-5438
Abstract: The purpose of the present work is to demonstrate the remarkable difference between Li-pyrrolide, on one hand, and Na and K ones, on the other, viz., if the former exists as two conformers, a and 7 with a significant preference to the pi, at least in the gas phase, Na- and K-pyrrolides only establish the stable pi structure. A key factor of its higher stabilization is the formation of the M+delta-N-sigma ionic pair (M = Li, Na, and K) where the alkali metal atom behaves as a cation interacting with the pyrrole ring via a typical pi-cation interaction. The formation of alkali metal pyrrolides is related to the reactions of the N-H bond-breaking H abstraction and a further hydrogen "walk" along the pyrrole ring resulting in nH-pyrrole. Both reactions are thoroughly studied, and four novel pathways for the pyrolysis of pyrrole starting, by means of the 1,2 H migration, from pyrrolenine (2H-pyrrole) and exiting along the HCN-propyne channel, are proposed.
Notes: Univ Louvain, Dept Chem, B-3001 Louvain, Belgium.
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ISSN: 1089-5639
e-ISSN: 1520-5215
ISI #: 000184084200009
Category: A1
Type: Journal Contribution
Validations: ecoom 2004
Appears in Collections:Research publications

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