Volume 57, Issue 48 pp. 15802-15806
Communication

Inorganic Triphenylphosphine

Dr. Adam D. Gorman

Dr. Adam D. Gorman

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

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Dr. Jonathan A. Bailey

Dr. Jonathan A. Bailey

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

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Dr. Natalie Fey

Dr. Natalie Fey

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

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Tom A. Young

Tom A. Young

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

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Dr. Hazel A. Sparkes

Dr. Hazel A. Sparkes

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

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Prof. Paul G. Pringle

Corresponding Author

Prof. Paul G. Pringle

School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS UK

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First published: 12 October 2018
Citations: 11

Graphical Abstract

Inorganic versus organic: the molecular structures and Lewis basicities of triphenylphosphine and tris(2-borazinyl)phosphine appear similar but their hydrolysis and oxygenation chemistry could hardly be more contrasting.

Abstract

A completely inorganic version of one of the most famous organophosphorus compounds, triphenylphosphine, has been prepared. A comparison of the crystal structures of inorganic triphenylphosphine, PBaz3 (where Baz=B3H2N3H3) and PPh3 shows that they have superficial similarities and furthermore, the Lewis basicities of the two compounds are remarkably similar. However, their oxygenation and hydrolysis reactions are starkly different. PBaz3 reacts quantitatively with water to give PH3 and with the oxidizing agent ONMe3 to give the triply-O-inserted product P(OBaz)3, an inorganic version of triphenyl phosphite; a corresponding transformation with PPh3 is inconceivable. Thermodynamically, what drives these striking differences in the chemistry of PBaz3 and PPh3 is the great strength of the B−O bond.

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