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2-phosphaindolizines

✍ Scribed by Neelima Gupta; Chandra B. Jain; Joachim Heinicke; Neetu Bharatiya; Raj K. Bansal; Peter G. Jones

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
225 KB
Volume
9
Category
Article
ISSN
1042-7163

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✦ Synopsis

Eight new 2-phosphaindolizines 2 have been obtained by [4 ‫ם‬ 1] cyclocondensation of 1,2dialkylpyridinium halides 1 with PCl 3 . The X-ray structure analysis of 2a is consistent with the integration of the 1,3-azaphosphole ring in the 10p-aromatic system. The charge densities on phosphorus of various representatives as obtained by PM3 calculations correlate approximately with the 31 P-NMR shifts. The mass spectral fragmentation of 2a resembles that of its nonphosphorus analog.

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Sulfur and selenium derivatives of 2-pho
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The 2-phosphaindolizines 1 react with hydrogen sulfide and elemental sulfur to give the new zwitterionic heterocyclic systems 2 of the N-pyridiniomethyl dithiophosphinate type. In contrast, no reaction is observed with sulfur alone. MeI methylates 2e,f at sulfur. The analogous pyridiniodiselenophosp