Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes

Tarasevych A, Shevchenko I, Rozhenko AB, Roeschenthaler G-V (2010)
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2010(10): 1552-1558.

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Abstract
The reaction of 1,8-dilithionaphthalene (1) with methylene-bis[(dialkylamino)chlorophosphanes] [R2N(CI)PCH2P(Cl)-NR2; R = Me (2a), Et (2b)] leads to the formation of new heterocyclic compounds, 1,3-diphospha-2,3-dihydro-1H-phenalenes 3a,b as a mixture of cis and trans isomers, DFT calculations indicate that the cis isomers are thermodynamically more stable by about 1-3 kcal/mol than the trans isomers. Compounds 3a,b can be converted into dithio the derivatives 5a,b and the borane complexes 6a,b, which were characterized by NMR spectroscopy and investigated by X-ray diffraction analysis. The dialkylamino groups in 3 can be substituted by chlorine to give the chlorophosphane 7.
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Tarasevych A, Shevchenko I, Rozhenko AB, Roeschenthaler G-V. Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. 2010;2010(10):1552-1558.
Tarasevych, A., Shevchenko, I., Rozhenko, A. B., & Roeschenthaler, G. - V. (2010). Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2010(10), 1552-1558.
Tarasevych, A., Shevchenko, I., Rozhenko, A. B., and Roeschenthaler, G. - V. (2010). Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2010, 1552-1558.
Tarasevych, A., et al., 2010. Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2010(10), p 1552-1558.
A. Tarasevych, et al., “Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes”, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, vol. 2010, 2010, pp. 1552-1558.
Tarasevych, A., Shevchenko, I., Rozhenko, A.B., Roeschenthaler, G.-V.: Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. 2010, 1552-1558 (2010).
Tarasevych, Arkadii, Shevchenko, Igor, Rozhenko, Alexander B., and Roeschenthaler, Gerd-Volker. “Synthesis of 1,3-Diphospha-2,3-dihydro-1H-phenalenes”. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 2010.10 (2010): 1552-1558.
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