[reaction: see text] The first example of an olefin ring-closing metathesis reaction on cationic heteroaromatic systems is described. Dihydroquinolizinium cations and a variety of related cationic systems are synthesized in an efficient approach from N-alkenyl alpha-vinyl azinium salts using Grubbs' catalysts.
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Núñez et al. (2004) studied this question.
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