Phosphorus tetraiodide

Derivation Hydrolysis of phosphorus tetraiodide and white phosphorus. 

Hypodiphosphoric acid, H4P2O4, 2/P-2/P, can be isolated from the hydrolysis products of phosphorus tetraiodide and may be regarded as the tautomer of the hydroxy derivative (5.247). This... 

Chlorine Trifluoride Tech. Bull. , Morristown, Baker Adamson, 1970 Incandescence is caused by contact with bromine, iodine, arsenic, antimony (even at -10°C) powdered molybdenum, niobium, tantalum, titanium, vanadium boron, carbon, phosphorus or sulfur [1], Carbon tetraiodide, chloromethane, benzene or ether ignite or explode on contact, as do organic materials generally. Silicon also ignites [2],... 

Both yellow and red phosphorus ignite on contact with fluorine and chlorine red ignites in liquid bromine or in a heptane solution of chlorine at 0°C. Yellow phosphorus explodes in liquid bromine or chlorine, and ignites in contact with bromine vapour or solid iodine [1]. Interaction of bromine and white phosphorus in carbon disulfide gives a slimy by-product which explodes violently on heating [2], Interaction of phosphorus and iodine in carbon disulfide is rather rapid [3], A less hazardous preparation of diphosphorus tetraiodide from phosphorus trichloride and potassium iodide in ether is recommended [4],... 

The reaction between dry phosphine and hydrogen iodide, first described in 1817 by J. J.Houtonde la Billardiere produces phosphonium iodide. The simplest laboratory preparation of this compound is by the hydrolysis of an intimate mixture of diphosphorus tetraiodide and white phosphorus According to X-ray diffraction investigations, phosphonium iodide crystallises in a caesium chloride type lattice 3m,32s). 326) hydrogen atoms... 

Also, the compound can be prepared by hydrolysis of a mixture of diphosphorus tetraiodide and white phosphorus ... 

EPOXIDES Diphosphorus tetraiodide. Lithium. 3-Methyl-2-selenoxo-l,3-benzothiazole. Phosphorus triiodide. Lithium. Potassium iodide-Zinc-Phos-phorus(V) oxide. Samarium(II) iodide. Sodium O.O-diethyl phosphorotelluro-ate. Triphenylphosphine hydroiodide-Triplienylphosphine diiodide. 

The mixture10 of diphosphorus tetraiodide and white phosphorus is introduced into flask A of the apparatus, which has been previously swept with carbon dioxide. This flask is constructed so as to fit a Glas Col spherical heating mantle which enables even heating. The connections between flask A and the condenser and between the condenser and flask B are wrapped in electrical heating tape which is connected to a variable source of power. 

Phosphorus, mixture of, with diphosphorus tetraiodide, 2 143 Phosphorus (III) bromide, 2 147 Phosphorus(III) chloride, 2 145 Phosphorus (V) chloride, 1 99 Phosphorus (III) S-chloroethoxydi-chloride, 4 66... 

Phosphoric add-Formic acid, 860 Phosphorodimorpholidic chloride, 861 Phosphorous add, 304 Phosphorus, red, 449, 861-864 Phosphorus diiodide, see Diphosphorus tetraiodide... 

The presence of the soft selenium atom and the hard oxygen however, make, the reaction of p-hydroxy selenides site selective. These have in fact been transformed selectively to vinylselenides 7) or olefins4-9,11 12), by selective activation of the hydroxy group, inter alia, with thionyl chloride alone or with thionyl, mesyl and phosphoryl chloride, trifluoracetic anhydride, phosphorus triiodide or diphosphorus tetraiodide in the presence of triethyl amine (Schemes 8Ab 8Bb). The formation of olefins from p-hydroxyselenides is regio- and stereoselective and occurs by formal removal of the hydroxyl and selenenyl moiety in an anti fashion. 

Phosphorus triiodide or diphosphorus tetraiodide/triethylamine at 20 °C (Scheme 43) carbonyl diimidazole or thiocarbonyl diimidazole/toluene at 110 °C, (Scheme 44) however, cleanly provide 87) alkylidene cyclopropanes from methylseleno derivatives. The best results are obtained with the first reagent for those (P-hydroxy-alkyl-methylselenides derived from aldehydes (Scheme 42) whereas PI3/NEt3 works parti-... 

Thus heating red phosphorus and lower alkyl iodides (ratio 1.5 3) in the presence of a trace of iodine or diphosphorus tetraiodide in an autoclave at 200 °C for eight hours, followed by treatment with aqueous sodium sulfite or successive treatments with nitric acid and aqueous base gave Me3PO (54%), Et3P0 (56%) and BU3PO (66%)... 

More important is the alkylation of red phosphorus in the presence of catalytic amounts of iodine or diphosphorus tetraiodide, which after hydrolytic working up leads to trialkylphosphine oxides, sometimes in high yield. Lower alkyl iodides are treated at 200-220° in a sealed tube or an autoclave,184 higher-boiling iodides at atmospheric pressure.185,186... 

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