An Iron-Catalyzed Route to Dewar 1,3,5-Triphosphabenzene and Subsequent Reactivity.

An Iron-Catalyzed Route to Dewar 1,3,5-Triphosphabenzene and Subsequent Reactivity.
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DOI:
10.1002/anie.202208663
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发表时间:
2022-09-12
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Webster RL
Webster RL
中科院分区:
其他
文献类型:
--
作者:
Barrett AN;Diefenbach M;Mahon MF;Krewald V;Webster RL

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The application of an alkyne cyclotrimerization regime with an [Fe(salen)]2‐μ‐oxo (1) catalyst to triphenylmethylphosphaalkyne (2) yields gram‐scale quantities of 2,4,6‐tris(triphenylmethyl)‐Dewar‐1,3,5‐triphosphabenzene (3). Bulky lithium salt LiHMDS facilitates a rearrangement of 3 to the 1,3,5‐triphosphabenzene valence isomer (3′), which subsequently undergoes an intriguing phosphorus migration reaction to form the ring‐contracted species (3′′). Density functional theory calculations provide a plausible mechanism for this rearrangement. Given the stability of 3, a diverse array of unprecedented transformations was investigated. We report novel crystallographically characterized products of successful nucleophilic/electrophilic addition and protonation/oxidation reactions. A mild, scalable iron‐catalyzed route to a Dewar phosphabenzene is presented. This species isomerizes in the presence of base to form the 1,3,5‐phosphabenzene, which then spontaneously rearranges to a novel triphospha(tricyclo) species. Onward coordination chemistry of all three phosphines is explored along with an extensive study into the reactivity of the Dewar phosphabenzene.
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