The cyclo-addition of 1,3-butadienes to aromatic hydrocarbons to form indans
β Scribed by T.F. Wood; J. Angiolini
- Publisher
- Elsevier Science
- Year
- 1963
- Tongue
- French
- Weight
- 357 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0040-4039
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π SIMILAR VOLUMES
5,6-Dimethylpyrazin-2-one reacts with iodomethane to give a quaternary salt, deprotonation of which liberates a 3-oxidopyrazinium which undergoes a 1,3-dipolar cycloaddition with methyl acrylate to form methyl 5,8-dimethyl-4-methylene-2-oxo-3,8-diazabicyclo[3.2.1]octane-6-__exo__-carboxylate, C~11~H
Thus, compound (I) with methylamine gave N,N,N'-trimethylformamidinium methyl sulfate (90 % yield), from which the hitherto unknown, free trimethylformamidine (b.p. 108 "C/740 mm.; ng = 1.4490) can be obtained in good yields. Compound (I) and dimethylamine form N,N,N',N'-tetramethylformamidinium met