1,3λ3-Azaphosphinine durch umsetzung von 3-azapyryliumsalzen mit tris(trimethylsilyl)phosphan

Aromaticity of Phosphorus Heterocycles

“…Among azaphosphinines, the 1,4-derivative was reported firstalthough only in solutionby Märkl and Matthes . The first derivative stable enough for isolation was 1,3-azaphosphinine . For the 1,2-aza- and 1,3,2-diazaphosphinines, an efficient synthesis has been designed recently .…”

1,3,2-Diazaphosphinines: New, Versatile Precursors of 1,2-Azaphosphinines and Polyfunctional Phosphinines

“…More interestingly, their reaction with alkynes affords 1,2-azaphosphinines 12 with extrusion of one molecule of nitrile. This [4 + 2] cycloaddition−cycloreversion process mimics the conversion of 1,3-azaphosphinines into phosphinines. ,, Upon further heating at higher temperature with a second equivalent of alkyne, these 1,2-azaphosphinines can, in turn, be converted into phosphinines. In such a way, we have prepared several polyfunctional phosphinines, as shown in the following equation (eq 3).

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“…Whereas all of the possible azaphosphinines are known to date, − our knowledge of diazaphosphinines is presently limited to a couple of examples . We wish to describe here a very simple access to 1,3,2-diazaphosphinines and their use to prepare 1,2-azaphosphinines and polyfunctional phosphinines.…”

Reactions of 2‐(1,3‐Dithiolan‐2‐ylidene)malononitrile with Amino‐ and Hydrazinophosphorus Compounds: A Facile Route to Functionalized Phosphorus Heterocycles

“…Whereas all of the possible azaphosphinines are known to date [18,19], our knowledge of diazaphosphinines is presently limited [20]. We wish to describe here a very simple route to 1,3,2-diazaphosphinine derivative.…”