L-thia-3-azoniabutatriene salts

Monocations derived by replacing carbon atoms in allenes with nitrogen atoms are of recent vintage. They were synthesized by Jochims and coworkers at the University of Konstanz in Germany in the 1980s. The l-aza-2-azoniaallenes, R2C=N+=NR, treated in this current chapter, react as 1,3-dipols in stepwise [3-1-2] cycloaddition reactions. 2-Azoniaallene salts, R2C=N+ R2, l-oxa-3-azonia-butatriene salts, R2C=N+=C=0, and l-thia-3-azoniabutatriene salts, R2C=N+=C=S, are treated in Chapter 5. 

For more details, see Chapter 5, Section 5.2. Also, l-oxa- and l-thia-3-azoniabutatriene salts undergo this reaction (see Chapter 5, Sections 5.3 and 5.4). 

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