Conclusion
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1.
The arguments for the phosphonium-phosphorane equilibrium involving the formation of a tricyclic phosphorane previously proposed for phosphonium salt cations R3 \(\mathop P\limits^ +\)CH2X (X=R2N, RO, HO, RS), were examined. This proposal was rejected in light of a) the observed nonequivalence of the isopropyl group methyl protons of [i-Pr2(Me)\(\mathop P\limits^ +\)CH2N(CH2CH2)2O] I− in its PMR spectrum in C5D5N solution, b) x-ray structural analysis of this salt (N⋯P distance 2.69(2) Å), and c) the configurational stability of [o-MeOC6H4 \(\mathop P\limits^ \oplus\)(Me)Pr2-i] I⊖ Up to 190°C. 2. Aminomethylphosphonium salts have aminomethylating action relative to MeO⊖, while phosphineomethylammonium salts do not react with Me.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2354–2363, October, 1982.
For Communication 19, see our previous work [1].
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Kostyanovskii, R.G., Él'natanov, Y.I., Shikhaliev, S.M. et al. Geminal systems Communication 20. Structure and properties of aminomethylphosphonium salts. Russ Chem Bull 31, 2073–2080 (1982). https://doi.org/10.1007/BF00950658
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DOI: https://doi.org/10.1007/BF00950658