The nitrogen atom in cyclic hetero-oligophosphane cyclo-P4Mes4C(NCy) (1) can be protonated with HCl or HBF4. The resulting cation was isolated as the BF4–, AlCl4– and GaCl4– salts and characterised by NMR spectroscopy, mass spectrometry and X-ray crystallography. According to quantum mechanical calculations, the basicity of compound 1 is comparable to that of methyl-substituted monophospha(III)guanidine. The pKα value of 1 was also determined experimentally with indicator bases.
Basicity of N-(Tetramesityltetraphosphacyclopentylidene)cyclohexylamine: An Unusual Diphospha(III)guanidine Derivative / A.K. Adhikari, T. Grell, P. Lonnecke, E. Hey-Hawkins. - In: EUROPEAN JOURNAL OF INORGANIC CHEMISTRY. - ISSN 1434-1948. - 2017:45(2017 Dec 08), pp. 5329-5333. [10.1002/ejic.201700869]
Basicity of N-(Tetramesityltetraphosphacyclopentylidene)cyclohexylamine: An Unusual Diphospha(III)guanidine Derivative
T. Grell;
2017
Abstract
The nitrogen atom in cyclic hetero-oligophosphane cyclo-P4Mes4C(NCy) (1) can be protonated with HCl or HBF4. The resulting cation was isolated as the BF4–, AlCl4– and GaCl4– salts and characterised by NMR spectroscopy, mass spectrometry and X-ray crystallography. According to quantum mechanical calculations, the basicity of compound 1 is comparable to that of methyl-substituted monophospha(III)guanidine. The pKα value of 1 was also determined experimentally with indicator bases.
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i201701329e_kap1.pdf
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