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Rachuru S, Vandanapu J, Skelton AA. Theoretical Determination of pKas of P(1)-H Phospholes and their Comparison with N(1)-H Azoles. Aust J Chem 2021. [DOI: 10.1071/ch21122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
pKas of P(1)-H deprotonation of all phosphole group compounds, phosphole (C4H4PH), 1,2 and 1,3-diphospholes (C3H3PPH), 1,2,3, and 1,2,4-triphospholes (C2H2P2PH), tetraphosphole (CHP3PH), and pentaphosphole (P4PH) are determined by DFT calculations. We have compared these to the pKas of the analogue azole group compounds and the factors that cause the differences of these values are discussed in terms of the stabilities of both the phosphole anions and azole anions.
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Abstract
Pentazole having the molecular formula HN5 is an archetypical five-membered homocyclic inorganic aromatic molecule consisting of five nitrogen atoms. A hydrogen atom is bonded to one of the nitrogens. Even though the molecule does not contain a carbon it appears last in the series of the heterocyclic azole family; the family containing one to five nitrogen atoms. This series of heterocyclic azoles is pyrrole, imidazole, pyrazole, triazole, tetrazole, and the last one is the pentazole. Barring pentazole, the rest of the members of the azole family are heterocyclic organic molecules. The pKa of N(1)H-acidity values of all the azole members are known, except for that of pentazole. In the present work we endeavoured to determine the pKa of pentazole by a graphical method and by performing theoretical DFT calculations.
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