Phosphonium, triphenyl tetraphenyl

To take advantage of both modified layered silicate and the substantial presence of phosphorus, the combined use of phosphorus-modified silicates and phosphorus compounds may represent an innovative solution to achieve high levels of flame retardancy. Phosphonium-modified layered silicates in epoxy resins were associated with organo-phosphorus FRs by Schartel et al.59 Ion exchange of Na-montmorillonite was carried out using tetraphenyl phosphonium bromide. Triphenyl phosphate and a reactive phosphorus compound were used as FR incorporated in the epoxy resin. 

Synthesis of Poly[lsobutylene-co-(4-Methylstyrenyl, Triphenyl Phosphonium Tetraphenyl Borate)]... 

Mechanical Behavior. The ionomers, - poly[Isobutylene-co-(4-methyl styrenyl, triphenyl phosphonium bromide or tetraphenyl borate)] were found to be different in physical appearance(hard and strong) and tougher than the starting material, the Exxpro elastomer. The mechanical properties of these quaternary phosphonium... 

Figure 2. NMR Data, Poly[Isobutylene-co-(4-methylstyrenyl, triphenyl phosphonium tetraphenyl borate)]...

Tetraphenyl phosphonium salts can be prepared from pentaphenylphosphorane by reaction with triphenyl boron, a hydrogen halide or an alkyl halide with ultraviolet radiation. 

Nucleophilic attack on phosphorus is not restricted to phosphonium salts, phosphines, and phosphoranes as Gottfried Markl has brilliantly demonstrated. Phenyllithium binds readily to the heteroelement of the faintly yellow 2,4,6-triphenyl-1-phosphabenzene (2,4,6-triphenylphosphorine). The resulting ate complex (69, Scheme 1-48) gives with methyl iodide the crystalline deep red 1-methyl-1,2,4,6-tetraphenyl-1 -phosphabenzene (76%). ... 

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