Electrophilic monoacylation of olefins possessing at least three carbon atoms leads to a mixture of&&and f##-unsaturated ketones. The latter (or, less probably, their enolic forms)
Pyrylium salts formed by diacylation of alkenes. : Part XII. Diacylation of 2-methylpropenylbenzene.
β Scribed by A.T. Balaban
- Publisher
- Elsevier Science
- Year
- 1963
- Tongue
- French
- Weight
- 203 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
THE forrfmtlor, of pyrylium salts by olefin described for the unsubstituted propene, 3 Boumania diacylation2 was for all four possible monosubstituted propenes where the substituent is an alkyl or a phenyl group (isobutene, ' l-pentene,5 a-methylsty-reneLCp5 and allylbenzene6 ), f or three from the seven possible disubstituted propenes (2-pentene, 5 2-methyl-2-butene' and 1,2_diphenylpropene 4 ), and for two from the six possible trisubstituted propenes. 496
π SIMILAR VOLUMES
Furans with side-chains at C(2) of various lengths terminating in diazomethyl keto groups are shown to undergo Rh\*(OAc),-catalyzed furan unravelling with the production of 2-cyclopentenone, 2-cyclohexenone, and 2-cycloheptenone to each of whose olefinic C(p) is attached an acrylaldehyde unit. Inter