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References (2)
-
A. Schmidpeter, K. Karaghiosoff (1991)
In Handbook of Phosphorus?31 Nuclear Magnetic Resonance Data -
K. Karaghiosoff (1990)
In Multiple bonds & Low Coordination in Phosphorus Chemistry
- Publisher
- Wiley
- Copyright
- Copyright © 2001 Wiley Subscription Services
- ISSN
- 1042-7163
- eISSN
- 1098-1071
- DOI
- 10.1002/hc.1091
- Publisher site
- See Article on Publisher Site
Abstract
Seven new pyridinium dichlorophosphinomethylides 2 have been obtained from dichlorophosphinylation of the pyridinium methylides generated in situ. 2 give 1,3‐bis(alkoxycarbonyl)‐2‐phosphaindolizines 4 through 1,5‐electrocyclization of the intermediate, bis(pyridinium ylidyl)phosphenium chloride 3 which is generated either from disproportionation of 2 or from the reaction of 2 with pyridinium methylide. Formation of 3 has been confirmed by carrying out a crossed reaction. 3‐Substituted 2 forms 4 regiospecifically. Intramolecular 1,5‐cyclocondensation of 2‐methylpyridinium dichlorophosphinomethylide is preferred over its disproportionation. © 2001 John Wiley & Sons, Inc. Heteroatom Chem 12:602–609, 2001
Journal
Heteroatom Chemistry – Wiley
Published: Jan 1, 2001