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- W2078875961 abstract "Mono- und Dicyan-substituierte Cyclopentadiene reagieren mit 2.6-Dimethyl-γ-pyron in Acetanhydrid zu den isomeren Heterosesquifulvalenen 5a-d bzw. 7a und b, deren Konstitution durch NMR-Messungen bestimmt wird. Der amphotere Charakter der Heterosesquifulvalene erlaubt elektrophile Substitution am Fünfring und nucleophilen O/N-Austausch im sechsgliedrigen Ring. 5a-d und 7a, b zeigen in den IR-Spektren intensive Banden bei ca. 1650 und 1350 cm−1; die Elektronenspektren weisen ein charakteristisches Maximum im Gebiet von 430 nm auf. Cyclopentadienylidenes, VI1). Cyano-substituted Heterosesquifulvalenes Containing Oxygen as Hetero Atom Condensation of mono- and dicyano-substituted cyclopentadienes with 2,6-dimethyl-γ-pyrone in acetic anhydride yields the isomeric heterosesquifulvalenes 5a-d and 7a, b, respectively. Their structures are distinguished by NMR. The amphoteric character of the heterosesquifulvalenes permits electrophilic substitution in the five-membered ring and nucleophilic O/N-exchange in the six-membered ring. 5a-d and 7a, b exhibit strong infrared maxima near 1650 and 1350 cm−1; the ultraviolet absorption spectra show a characteristic maximum near 430 nm." @default.
- W2078875961 created "2016-06-24" @default.
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- W2078875961 date "1970-03-16" @default.
- W2078875961 modified "2023-09-27" @default.
- W2078875961 title "Cyclopentadienylidene, VI1) Cyan-substituierte Heterosesquifulvalene mit Sauerstoff als Heteroatom" @default.
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- W2078875961 doi "https://doi.org/10.1002/jlac.19707320112" @default.
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