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- W2025782805 abstract "Anders als acyclische Phosphanimide geben die zum Fünfring geschlossenen Azaphosphole (1) und Azaphospholine (4) mit Arylnitriloxiden, Diphenylnitrilimin und Nitronen stabile, kristallin isolierbare [3 + 2]-Cycloaddukte (3, 5, 8, 9, 11). Der Brückenkopfeinbau des Phosphors in das Bicyclooctangerüst der Addukte begünstigt seine Pentakoordination und damit die Adduktstabilität; spektroskopische Befunde sprechen für die meridionale Anordnung des Bicyclus. Bezüglich der 1.3-Dipole ist die Cycloaddition in gewohnter Weise,. bezüglich der Phosphorsubstituenten Me > Ph > Nme2 abgestuft. Die Addukte des 3,4-Dihydroisochinolin-N-oxids (11f, g) dissoziieren in Lösung reversibel in die Komponenten. Four- and Five-membered Phosphorus Heterocycles, 361) 1,3-Dipolar Cycloadditions to Azaphospholes and Azaphospholines Different from acyclic phosphane imides five-membered cyclic one, such as azaphospholes (1) and azaphospholines (4), give stable [3 + 2]-cycloadducts (3, 5, 8, 9, 11) with arylnitrile oxides diphenylnitrile imine, and nitrones which can be isolated in crystalline form. The bridgehead position in the bicyclooctane structure of the adducts favours phosphorus pentacoordination and thus enhances adduct stability; NMR spectroscopic results agree to the meridional arrangement of the bicyclus. The cycloaddition to azaphospholes depends on the 1.3-dipoles in an order known from other dipolarophiles and decreases with the phosphorus substituents Me > Ph > NMe2 The adducts of the 3,4-dihydroisoquinoline N-oxide (11f, g) dissociate reversibly in solution." @default.
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- W2025782805 date "1979-10-01" @default.
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- W2025782805 title "Vier‐ und fünfgliedrige Phosphorheterocyclen, 36 <sup>1)</sup> 1,3‐Dipolare Cycloadditionen an Azaphosphole und Azaphospholine" @default.
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- W2025782805 doi "https://doi.org/10.1002/cber.19791121014" @default.
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