- Intramolecular formal [4+2] cycloaddition of 3-ethoxycyclobutanones and alkenes
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Intramolecular formal [4+2] cycloaddition between 3-ethoxycyclobutanones and a carbon-carbon double bond to the corresponding bicyclo[4.n.0]alkan-2-one derivatives proceeded effectively by using ethylaluminium dichloride. The Royal Society of Chemistry 20
- Matsuo, Jun-Ichi,Sasaki, Shun,Hoshikawa, Takaya,Ishibashi, Hiroyuki
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supporting information; experimental part
p. 934 - 936
(2010/06/12)
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- Photoreactions of γ,δ-unsaturated chromium carbene complexes
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A number of functionalized γ,δ-unsaturated chromium carbene complexes were synthesized, and their photochemistry was studied. Photolysis of carbene complexes 5 and 17 induced intramolecular [2 + 2] cycloaddition to afford cyclobutanones 6 and 18, respectively. If the photoreactions were not run in thoroughly degassed solvents, small amounts of lactones 7 and 19 were obtained as well. Cyclobutanones 6 and 18 were stable once isolated, but underwent an acid-catalyzed Pinacol rearrangement/hydrolysis transformation in acidic solution to afford novel α-hydroxy-substituted bicyclo[3.1.0]hexanone compounds 20 and 21. Photolysis of cyclopropyl carbene complex 28 induced a vinylcyclopropyl rearrangement involving the photogenerated ketene moiety to provide α-alkoxy cyclopentenone 29.
- Moser, William H.,Hegedus, Louis S.
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p. 7873 - 7880
(2007/10/03)
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