Cyclopentaphosphine is the inorganic compound with the formula (PH)5. It is prepared by the hydrolysis of cyclo-[PSiMe3]4 (Me = methyl). Although only of theoretical interest, (PH)5 is parent of many related cyclic polyphosphines that are the subject of research.
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| Names | |
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| IUPAC name pentaphospholane | |
| Other names Cyclopentaphosphane, pentaphosphole | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| EC Number |
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PubChem CID | |
CompTox Dashboard (EPA) | |
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| Properties | |
| H5P5 | |
| Molar mass | 159.909 g/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Organic cyclophosphines
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Organic cyclophosphanes are a family of organophosphorus compounds with the formula (RP)n where R is an organic substituent. Many examples are known. They are white, air-sensitive solids which have good solubility in organic solvents. Well-characterized examples are known for ring sizes 3–6. The three-membered rings feature bulky substituents, e.g., [tert-BuP]3.
The cyclophosphines can be prepared by several methods, one involves reductive coupling of dichlorophosphines:[2]
- 5 PhPCl2 + 5 Mg → [PhP]5 + 5 MgCl2
Isomerism
The structures are complicated by the slow pyramidal inversion at phosphorus(III). In principle, many isomers are possible for cyclo-P5R5, but usually only one is observed.[3] All phenyl substituents are equatorial in cyclo-P6(C6H5)6.[4]