Phosphorus III Iodide

Buehler, C. A. Pearson, D. E. Survey of Organic Syntheses, Wiley New York, 1970 pp 860-861. 

Advanced Organic Chemistry Reactions, Mechanisms, and Structures, 3rd ed. Wiley New York, 1985 pp 807-809. 

Solubility very sol CS2 reacts with protic solvents. 

Form Supplied in red solid widely available commercially. Handling, Storage, and Precautions conmiercial samples are generally suitable for use without purification store under an inert atmosphere. 

A variety of methods for the reduction of sulfoxides to sulfides are available. PI3 rapidly reduces aryl alkyl and dialkyl sulfoxides and selenoxides, usually at —78 °C (eq 3). For example, treatment of ethyl phenyl sulfoxide with 1 equiv of PI3 (CH2CI2, -78 °C, 15 min) affords ethyl phenyl sulfide in 91% yield. Others have successfully employed this procedure. Dialkyl sulfoxides generally react in somewhat lower yield. A phenyl vinyl sulfoxide (eq 3, entry c) requires ambient temperatures to react. Selenoxides behave similarly, and P2I4 can usually be used in place of PI3. Treatment of decyl phenyl selenone with PI3 (CH2CI2, 0 °C, 30 min) affords a mixture of the reduced product, decyl phenyl se-lenide (69%), and the substitution product, n-decyl iodide.  

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Phosphorus(III) iodide, Pl3. Mol. wt. 411.71. The reagent is obtained by reaction of white phosphorus with 1.3 moles of I3 in CS2. Supplier Alfa. 

Phosphorus(III) isocyanate was first prepared by the reaction of phosphorus(III) chloride with silver isocyanate in warm benzene.1 A later modification utilized phosphorus(III) iodide as a starting material with nitromethane as solvent.2... 

PI3 phosphorus (iii) iodide 13455-01-1 gas 0.000 1 4265 Si02 silicon dioxide (alpha quartz) 14808-60-7 quartz 0.579 1... 

Phenylp-tolueneselenosulfonate, 315 Phenyl trimethylsilyl selenide, 438, 439 Phenyl vinyl sulfone, 170, 315-316 Phosphonomycin, 390 Phosphoric acid, 317 Phosphoric acid-Formic acid, 317-318 Phosphorus(III) chloride, 318 Phosphorus(III) iodide, 318-319 Phosphorus(V) oxide, 319 Phosphorus(V) sulfide, 320 Phthalides, 383... 

Phosphorus (III) iodide can be prepared either from red or white P, dissolved in CSg, by reaction with a solution of Ig in CSg ... 

Preparative Method prepared in 80-90% yield from commercially available 1-methyl-2(li -pyridone by treatment with phosphorus(III) iodide at 130 °C for 4-5 h. 

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