Phenylphosphine

Phenylphosphine
Names
Preferred IUPAC name
Phenylphosphane
Other names
Phenylphosphine
Monophenylphosphine
Identifiers
CAS Number
  • 638-21-1 checkY
3D model (JSmol)
  • Interactive image
ChemSpider
  • 12002 checkY
ECHA InfoCard 100.010.297 Edit this at Wikidata
EC Number
  • 211-325-4
PubChem CID
  • 12519
RTECS number
  • SZ2100000
UNII
  • 856X9KP929 checkY
UN number 2924
CompTox Dashboard (EPA)
  • DTXSID7073224 Edit this at Wikidata
InChI
  • InChI=1S/C6H7P/c7-6-4-2-1-3-5-6/h1-5H,7H2 ☒N
    Key: RPGWZZNNEUHDAQ-UHFFFAOYSA-N ☒N
  • InChI=1/C6H7P/c7-6-4-2-1-3-5-6/h1-5H,7H2
    Key: RPGWZZNNEUHDAQ-UHFFFAOYAH
  • C1=CC=C(C=C1)P
Properties
Chemical formula
 C6H5PH2
Molar mass 110.09 g/mol
Appearance Colorless liquid
Odor foul
Density 1.001 g/cm3
Boiling point 160 °C (320 °F; 433 K)
Hazards
GHS labelling:
Pictograms
 GHS02: FlammableGHS06: ToxicGHS07: Exclamation mark
Warning
Hazard statements
 H250, H301, H311, H315, H319, H331, H335
Precautionary statements
 P210, P222, P261, P264, P270, P271, P280, P301+P310, P302+P334, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P370+P378, P403+P233, P405, P422, P501
NIOSH (US health exposure limits):
PEL (Permissible)
 none[1]
REL (Recommended)
 C 0.05 ppm (0.25 mg/m3)[1]
IDLH (Immediate danger)
 N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound

Phenylphosphine is an organophosphorus compound with the chemical formula C6H5PH2. It is the phosphorus analog of aniline. Like other primary phosphines, phenylphosphine has an intense penetrating odor and is highly oxidizable. It is mainly used as a precursor to other organophosphorus compounds. It can function as a ligand in coordination chemistry.

Synthesis

Phenylphosphine can be produced by reducing dichlorophenylphosphine with lithium aluminum hydride in ether:

LiAlH4 + 2C6H5PCl2 → 2C6H5PH2 + Li+ + Al3+ + 4Cl−

This reaction is performed under a nitrogen atmosphere to prevent side reactions involving oxygen.[2]

Reactions

Oxidation of phenylphosphine with air affords the oxide.[2]

C6H5PH2 + O2 → C6H5P(OH)2

Bis(2-cyanoethylphenyl)phosphine, which is of interest as a synthetic intermediate, can be made from phenylphosphine by base-catalyzed allylic addition to acrylonitrile.

C6H5PH2 + 2CH2=CHCN → C6H5P(CH2CH2CN)2

Bis(2-cyanoethylphenyl)phosphine is a useful precursor to 1-phenyl-4-phosphorinanone by base-induced cyclization followed by hydrolysis. Phosphorinanones can be used to prepare alkenes, amines, indoles, and secondary and tertiary alcohols by reduction, Grignard, and Reformatsky reagents.[3]

Phenylphosphine reacts with many metal complexes to give complexes and clusters.[4] It is the precursor to the bridging phosphinidene ligand in certain clusters.

2 (C6H5)2MCl + C6H5PH2 + 3 (C2H5)3N → ((C6H5)2M)2PC6H5 + 3 (C2H5)3N•HCl

Phenylphosphine also have uses in polymer synthesis. Using radical initiations or UV irradiation, polyaddition of phenylphosphine to 1,4-divinylbenzene or 1,4-diisopropenylbenzene will form phosphorus-containing polymers, which have self-extinguishing properties. When mixed with flammable polymers such as polystyrene and polyethylene, the mixed polymer exhibits flame resistant properties.[5]

References

  1. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0501". National Institute for Occupational Safety and Health (NIOSH).
  2. ^ a b Freedman, Leon D.; Doak, G. O. (1952). "The Reduction of Benzenephosphonyl Dichloride". Journal of the American Chemical Society. 74 (13): 3414–3415. doi:10.1021/ja01133a504.
  3. ^ Snider, Theodore E.; Morris, Don L.; Srivastava, K. C. & Berlin, K. D. (1988). "1-Phenyl-4-Phosphorinanone". Organic Syntheses; Collected Volumes, vol. 6, p. 932.
  4. ^ Schumann, Herbert; Schwabe, Peter; Stelzer, Othmar (1969). "Organogermyl, stannyl und plumbylphosphine". Chemische Berichte. 102 (9): 2900–2913. doi:10.1002/cber.19691020904.
  5. ^ Obata, Takatsugu; Kobayashi, Eiichi; Aoshima, Sadahito; Furukawa, Junji (1994). "Synthesis of new linear polymers containing phosphorus atom in the main chain by the radical polyaddition: Addition polymers of phenylphosphine with 1,4-divinylbenzene or 1,4-diisopropenylbenzene and their properties". Journal of Polymer Science Part A: Polymer Chemistry. 32 (3): 475–483. Bibcode:1994JPoSA..32..475O. doi:10.1002/pola.1994.080320309.