Computational and experimental approaches to the molecular structure of the HCl adduct of Me3PO by Andreas Orthaber and others 2026-10-20
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Andreas Orthaber, Ferdinand Belaj and Rudolf Pietschnig, Comptes Rendus Chimie 13 (2010), 923–928. Section 3.2 analyses the strongly polar P–O sigma bond and oxygen lone-pair negative hyperconjugation; this is not a claim that every orbital-localization scheme assigns the same bond order.
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