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- W2015800571 abstract "1,1-Bis[(diphenylphosphanyl)methyl]ethene (3) reacts with PCl3 or AsCl3 in the presence of SnCl2 as a reducing agent to form cationic heterocycles in which the two newly generated phosphonium centers are bridged by two-coordinate, negatively charged phosphorus (4a) or arsenic (4b) centers. Hexachlorostannate(IV) dianions function as counterions to these heterocycles, in which the exocyclic methylene group is retained. By treatment of 4a with a base a rearrangement is induced which includes a proton migration from an endo-to the exocyclic CH2 group to give 5-methyl-1,1,3,3-tetraphenyl-1λ5,2λ3,3λ51-triphosphinine (5), a novel 1,2,3-triphosphabenzene species. The reaction of the arsenic compound 4b with base did not yield the corresponding arsa-diphosphabenzene, but gave only decomposition products. Compound 4b · 0.5 CH3CN has been studied by X-ray crystallography. The six-membered heterocycle shows a chair conformation with an arsenic atom solely coordinated by two phosphorus atoms at roughly equal distances with a sharp angle P – As – P of only 93.0(1)°." @default.
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- W2015800571 date "1993-03-01" @default.
- W2015800571 modified "2023-09-23" @default.
- W2015800571 title "Synthesis and Molecular Structure of Heterocycles Containing two Phosphorus(V) Centers Bridged by Two‐Coordinate Phosphorus and Arsenic" @default.
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- W2015800571 doi "https://doi.org/10.1002/cber.19931260309" @default.
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