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- W2063719797 endingPage "1813" @default.
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- W2063719797 abstract "Syntheses of Moniliformin, a Mycotoxine with a Cyclobutenedione Structure Six different routes to 3-hydroxy-3-cyclobutene-1, 2-dione (4), the free acid of the mycotoxine Moniliformin (=alkali salt of 4) are described. A common feature of all pathways is the synthesis of cyclobutanes having the oxidation level 6. Moniliformin precursors which are easily transformed to 4 by acid catalysed hydrolysis include [2+2]-cycloadducts of ketene with tetraalkoxy-olefins, 3,4,4-trialkoxycyclobutenes, derivatives of polyfluorinated cyclobutenes, the brominated [2+2]-cycloadduct of ethyl vinyl ether and dichloroketene, tetrabromocyclobutanone, [2+2]-photocycloadducts of dichlorovinylenecarbonate with dichloroethylenes, and the dimer of chloroketene. The most convenient synthesis via the [2+2]-cycloadduct of tetraethoxyethylene and ketene (14b) is reported in detail and produces 4 in four simple steps in 57% overall yield. In addition, two new syntheses of squaric acid (56) are described." @default.
- W2063719797 created "2016-06-24" @default.
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- W2063719797 creator A5006007417 @default.
- W2063719797 creator A5047125398 @default.
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- W2063719797 date "1978-07-12" @default.
- W2063719797 modified "2023-10-16" @default.
- W2063719797 title "Synthesen von Moniliformin, einem Mycotoxin mit Cyclobutendion-Struktur" @default.
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- W2063719797 doi "https://doi.org/10.1002/hlca.19780610526" @default.
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