- Synthesis and Decomposition of λ3- and λ5-Tetrazaphospholenes
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Iminophosphanes 4a - c react with tert-butyl azide by -cycloaddition to give λ3-tetrazaphospholenes 8a - c.These compounds decompose thermally or photochemically by N2-elimination, forming diiminophosphoranes 9a, b, b', c by intramolecular oxidation of the phosphorus atom, where 9c can only be captured as its -cycloaddition products 11c and 12c.The reaction of the diiminophosphoranes 7a, 9a, and 9c with tert-butyl or ethyl azide yields the λ5-tetrazaphospholenes 10a', 10c - g.Compounds of this type (10i', h) are also a available by the reaction of 4b, c with ethyl azide.In contrast to the λ3-tetrazaphospholene system 8, the oxidized form 10 -cycloreverses thermally as shown for 10a', while photochemically forms the λ5-diazaphosphoridine 14 under N2-elimination.The NMR data and the decomposition of the tetrazaphospholenes are discussed.
- Niecke, Edgar,Schaefer, Hans-Guenther
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p. 185 - 200
(2007/10/02)
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