- Double (internal/external) alkyne insertion reactions of α-diazoketones
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Acetylenic α-diazoketone 5, when treated with Rh2(OAc)4 and several different alkynes, gives alkyne insertion/cyclopropenation products. Subsequent catalytic ring opening reactions demonstrate a highly regioselective net double alkyn
- Hoye,Dinsmore
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p. 3755 - 3758
(2007/10/02)
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- 1?,?*-Induced Photocleavage of γ,δ-Epoxy-eucarvone
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On 1?,Π*-excitation 1 undergoes cleavage of the C,C-oxirane bond (1 -> c) and isomerizes to the bicyclic dihydrofurane compound 5.In addition, 1 shows photocleavage of the C(γ),O-oxirane bond (1 -> d) and gives the isomers 2, 3, 6, 7 and 8.Furthermore, the cyclohexenone 9 and the cyclohexene-1,4-dione formed presumably via an intermediate 13, which could also arise from d.Besides these products the compounds 11 and 12 are obtained, which are photoproducts of 2.
- Tsutsumi, Kentaro,Wolf, Hans Richard
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p. 2370 - 2374
(2007/10/02)
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