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Issue 24, 2013
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Synthesis and DFT calculations of spirooxaphosphirane complexes

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In situ formed Li/Cl phosphinidenoid complexes [Li(12-crown-4)][M(CO)5(ClPC5Me5)] 3a–c (M = Cr, Mo, W) reacted with cyclobutanone (4), cyclopentanone (5) and cyclohexanone (6) in Et2O to yield the first P-C5Me5 substituted C3-spirofused oxaphosphirane complexes 7a–c, 8a and 9a,a′. In the case of cyclopentanone and 1a the outcome of the reaction in THF was different: here the formation of 8a along with (anionic) phosphinoate complexes 14a and 15a was observed, the latter possess an unusual ring-opened oxaphosphirane and 2-cyclopentylidenecyclopentanone as co-ligands to the lithium cation. NMR, IR and MS data as well as single-crystal X-ray structures in the case of 7a–c, 8a, 9a and 15a are reported. DFT calculations on the parent 1-oxa-2-phosphaspiro[2.n]alkane pentacarbonylchromium(0) complexes 10 (a: n = 2; b: n = 3; c: n = 4; d: n = 5) revealed that both ring strain energies and G(r) values decrease significantly as the spiroring size increases. This is caused by an increase in the exocyclic α bond angle at the oxaphosphirane C3 atom, hence decreasing the s-character of the corresponding orbitals involved in endocyclic bonds at C3 and thus becoming better suited for accommodation of small ring angles.

Graphical abstract: Synthesis and DFT calculations of spirooxaphosphirane complexes

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The article was received on 28 Feb 2013, accepted on 26 Apr 2013 and first published on 09 May 2013

Article type: Paper
DOI: 10.1039/C3DT50556A
Dalton Trans., 2013,42, 8897-8906

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    Synthesis and DFT calculations of spirooxaphosphirane complexes

    C. Albrecht, E. Schneider, M. Engeser, G. Schnakenburg, A. Espinosa and R. Streubel, Dalton Trans., 2013, 42, 8897
    DOI: 10.1039/C3DT50556A

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