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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
A Tetracyclic Octaphosphane by Successive Addition, Inversion, and Condensation Reactions
Felix Hennersdorf1, Jan J Weigand1
1Professur für Anorganische Molekülchemie, Technische Universität Dresden, 01062, Dresden, Germany.
Abstract:
An example of an octaphosphane of type R2 P8 (R=(DDP)Ga) was isolated by treatment of cage compound (DDP)GaP4 (2, DDP=(2,6-diisopropylphenyl)(4-((2,6-diisopropylphenyl)imino)pent-2-en-2-yl)amide) with (C6 F5 )2 PBr. The initially formed endo-exo butterfly shaped pentaphosphane 7 rapidly rearranges to the more stable exo-exo isomer 8, which undergoes dimerization to decaphosphane 11. Compound 11 unexpectedly eliminates tetraaryldiphosphane 13 to give tetracyclo[3.3.0.02,7 .04,6 ]octaphosphane [(DDP)GaBr]2 P8 (12). The reaction steps were confirmed by crystal structure analysis of the key intermediates and supported by kinetic studies using NMR techniques.
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