2-Alkoxyearbonylpyridinium N-aminides behave as 1,3-dipoles when reacted with Michael aeeeptors, giving rise to the corresponding cycloadducts which, depending on their regioisomeric nature, subsequently undergo a ring expansion to give pyrido[1,2-b]pyridazinium inner salts.
β¦ LIBER β¦
1,3-Dimethylimidazolidiniodithioacetates; stable inner salts having a 1,4-dipolar structure
β Scribed by Juzo Nakayama; Keiichi Akimoto; Yoshiaki Sugihara
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- French
- Weight
- 254 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Addition of carbon disulfide to 2-isopropylidene-and2-methylene-l,3dimethylimidazolidines gave the thermally stable, crystalline inner salts, 1,3-dimethylimidazolidiniodithioacetates (10 and 12), where carbenium ion and dithiocarboxylate parts are insulated by an sp 3 carbon atom. X-Ray diffraction analyses of these compounds and the reaction of 10 with DMAD are described.
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