- CIRCULAR ECONOMY METHODS OF PREPARING UNSATURATED COMPOUNDS
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Methods of preparing unsaturated compounds or analogs through dehydrogenation of corresponding saturated compounds and/or hydrogenation of aromatic compounds are disclosed.
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Paragraph 0068
(2018/01/18)
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- A Regioselective Synthesis of Cyclopentenones from 4-Thianone
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Alkyl-substituted 3-cyclopentenones 4 and 5 were prepared in moderate to good yields starting from 4-thianone by the selective alkylation and Ramberg-Baecklund-type reactions.One route starts with 6-alkyl-1,4-dioxa-8-thiaspirodecane 8,8-dioxides (8) and another with 7-alkyl-1,4-dioxa-7-(p-tolylsulfonyl)-8-thiaspirodecane 8,8-dioxides (15), followed by acid-catalyzed cleavage of the 1,3-dioxolane ring of 1,4-dioxaspironon-7-enes 9 and 16 to afford 4 and 5.
- Matsuyama, Haruo,Miyazawa, Yasuyuki,Takei, Yuji,Kobayashi, Michio
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p. 1703 - 1710
(2007/10/02)
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- 1,4-Ketoaldehydes via Michael-Addition of deprotonated Aldimines to 2-(N-Methylanilino)-acrylonitrile
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A new method for the synthesis of the title compounds by a one-pot three component coupling reaction is described.It consists of the reaction of an enolateanion- and an enolcation-equivalent with subsequent alkylation of an acylanion-equivalent.
- Ahlbrecht, Hubertus,Daacke, Axel von
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- TETRAHYDROTHIOPYRAN-4-ONE. A USEFUL 5 C SYNTHON FOR THE SYNTHESIS OF 3-CYCLOPENTENONES
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2-Alkyl-3-cyclopentenones were prepared in moderate yields starting from tetrahydrothiopyran-4-one by the one-pot Ramberg-Baecklung reaction of 6-alkyl-1,4-dioxa-8-thiaspirodecane-8,8-dioxides, followed by acid catalyzed de-dioxolanation.
- Matsuyama, Haruo,Miyazawa, Yasuyuki,Takei, Yuji,Kobayashi, Michio
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p. 833 - 836
(2007/10/02)
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