Heterocyclic Betaines Isoelectronic with Non-Kekule Dianions

Heterocyclic Betaines Isoelectronic with Non-Kekule Dianions 

Cotton and G. Wilkinson, Advanced Inorganic Chemistry. A Comprehensive Text, 3rd ed., p. 358. Wiley (Interscience), New York, 1972. 

in Comprehensive Inorganic Chemistry (A. F. Trotman-Dickenson, ed.), Vol. 2, p. 342. Pergamon, Oxford, 1973. 

Rawcliffe and D. H. Rawson, Principles of Inorganic and Theoretical Chemistry, 2nd ed., p. 252. Heinemann, London, 1974. 

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B. Heterocyclic Betaines Isoelectronic with Non-Kekule Dianions... 

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