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- W2068140277 abstract "Die Dithionmalonester 1 bilden mit Alkalialkoholat die stabilen Alkalisalze 2. Ihre Anionen liegen laut Rontgenstrukturanalyse fur das N,N,N′,N′-Tetramethylformamidinium Salz 18 kristallin in der trans,s-trans-Konfiguration vor; dasselbe trifft laut NOE-Messung fur Losungen in DMSO oder D2O zu. Die Alkylierung von 2 liefert jedoch die Z-konfigurierten Thionacrylester 4. Durch Oxidation von 1a mit tert.-Butylhypochlorit oder D2O zu. Die Alkylierung von 2 liefert jedoch die Z-konfigurierten Thionacrylester 4. Durch Oxidation von 1a mit tert.-Butylhypochlorit methylaminomethylen-Verbindung 12, wahrend in Ether das Formamidiniumsalz 18 gebildet wird. Letzteres zerfallt in N,N-Dimethyl-thioformamid 20 und de Thionacrylester 21.Thiono and Dithio Esters, 41. - Reaction of Dithiono Malonic Esters with ElectrophilesDithiono malonic esters 1 react with alkali alkoxides to form the stable alkali salts 2. According to an X-ray analysis for the N,N,N′,N′-tetramethylformamidinium salt 18 their anions adopt a trans,s-trans configuration in the crystalline state. By NOE experiments the same configuration is confirmed for solutions ([D6]DMSO or D2O). Alkylation of 2, however, gives rise to the Z-configurated thiono acrylic esters 4, By oxidation of 1a with tert.-butyl hypochlorite or iodine the 1,2-dithiolium salts 5 and 7 were obtained. The reaction of 1a with N,N-dimethylformamide diethylacetal (8) in ethanol leads to the formation of the dimethylaminomethylene compound 12, in ether the formamidinium salt 18 precipitates. The latter decomposes to N,N-dimethyl thioformamide 20 and the thiono acrylic ester 21." @default.
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- W2068140277 date "1988-01-01" @default.
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- W2068140277 title "Thion- und Dithioester, 41. Mitt. Zur Reaktion von Dithionmalonsäureestern mit Elektrophilen" @default.
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- W2068140277 doi "https://doi.org/10.1002/ardp.19883211209" @default.
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