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Cycloadditions of Aryl-Substituted 1,2,4-Triazines with 2-Cyclopropylidene-1,3-dimethylimidazolidine — Zwitterions as Discrete Intermediates.

✍ Scribed by Michael Ernd; Manfred Heuschmann; Hendrik Zipse

Publisher
John Wiley and Sons
Year
2005
Weight
27 KB
Volume
36
Category
Article
ISSN
0931-7597

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## Abstract Cycloadditions of 2‐cyclopropylidene‐1,3‐dimethylimidazolidine (**1**), a strong, electron‐rich C‐nucleophile, with a variety of aryl‐substituted 1,2,4‐triazines occur at temperatures between −100 and +100°, depending on the substitution pattern. At low temperatures, zwitterions, formed

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