Abstract
The single crystal structure of bis(2,4,6-trimethylphenyl)phosphine oxide has been determined. All interatomic distances and angles can be considered normal. The aryl substituents adopt an intermediate configuration when compared to both sterically unhindered (e.g., diphenylphosphine oxide) and congested (e.g., bis(2,4,6-tri-tert-butylphenyl)phosphine oxide) secondary phosphine oxides, illustrating the influence of steric congestion on the molecular structure.
Highlights
The importance of organophosphorus compounds is illustrated by their widespread applications in areas of organic [1,2], inorganic [3,4], medicinal [5,6,7,8], and material [9] chemistries.Over the past decade, the synthetic potential of secondary phosphine oxides has become increasingly well-established
Crystals of the title compound were grown by pentane evaporation, and a crystal structure was obtained (Figure 1)
The mesityl rings exhibit a twist of 31.93(16)◦ that is intermediate in magnitude when compared to diphenylphosphine oxide [17] (1.2◦, relatively unhindered) and bis(2,4,6-tri-tert-butylphenyl)phosphine oxide [19] (52.4◦, extremely congested), illustrating the influence of steric congestion on the molecular structure of the compound
Summary
The importance of organophosphorus compounds is illustrated by their widespread applications in areas of organic [1,2], inorganic [3,4], medicinal [5,6,7,8], and material [9] chemistries. The synthetic potential of secondary phosphine oxides has become increasingly well-established. These compounds are precursors to phosphinoyl radicals; they are effective reagents in phosphorylation reactions [10,11,12] due to the accessible P–H bond dissociation energies Given the utility of these compounds, it seemed pertinent to report the single crystal structure of the title compound bis(2,4,6-trimethylphenyl)phosphine oxide, 1
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