triphenylarsine
{{Chembox
| Watchedfields = changed
| verifiedrevid = 470616659
| ImageFile1 = TriphenylarsinePic.svg
| ImageFile2 = Triphenylarsine-3D-balls.png
| ImageSize2 = 244
| ImageName2 = Ball and stick model of aromatic triphenylarsine
| PIN = Triphenylarsane
| SystematicName =
| OtherNames = Tribenzenidoarsenic
Triphenylarsine
|Section1={{Chembox Identifiers
| CASNo = 603-32-7
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = MN8EZ3FL74
| PubChem = 11773
| ChemSpiderID = 11280
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| EINECS = 210-032-9
| UNNumber = 3465
| RTECS = CH8942500
| SMILES = C1=CC=C(C=C1)[As](C1=CC=CC=C1)C1=CC=CC=C1
| SMILES1 = c1ccc(cc1)[As](c2ccccc2)c3ccccc3
| StdInChI = 1S/C18H15As/c1-4-10-16(11-5-1)19(17-12-6-2-7-13-17)18-14-8-3-9-15-18/h1-15H
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| InChI = 1/C18H15As/c1-4-10-16(11-5-1)19(17-12-6-2-7-13-17)18-14-8-3-9-15-18/h1-15H
| StdInChIKey = BPLUKJNHPBNVQL-UHFFFAOYSA-N
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| InChIKey = BPLUKJNHPBNVQL-UHFFFAOYAO}}
|Section2={{Chembox Properties
| C=18 | H=15 | As=1
| Appearance = Colourless solid
| Density = 1.395 g cm−3
| MeltingPtC = 58 to 61
| BoilingPtC = 373
| BoilingPt_notes = at 760 mmHg
| Solubility = Insoluble
| SolubleOther = Soluble in ethyl ether, benzene, slightly soluble in ethanol
| MagSus = −177.0·10−6 cm3/mol
}}
|Section3={{Chembox Structure
| CrystalStruct = Triclinic}}
|Section4={{Chembox Hazards
| GHSPictograms = {{GHS06}}{{GHS09}}
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|301|331|410}}
| PPhrases = {{P-phrases|261|264|270|271|273|301+310|304+340|311|321|330|391|403+233|405|501}}
}}
|Section5={{Chembox Related
| OtherFunction_label = organoarsanes
| OtherFunction = Trimethylarsine
| OtherCompounds = Triphenylamine
}}
}}
Triphenylarsine is the chemical compound with the formula As(C6H5)3. This organoarsenic compound, often abbreviated AsPh3, is a colorless crystalline solid that is used as a ligand and a reagent in coordination chemistry and organic synthesis. The molecule is pyramidal with As-C distances of 1.942–1.956 Å and C-As-C angles of 99.6–100.5°.Mazhar-ul-Haque, Hasan A. Tayim, Jamil Ahmed, and William Horne "Crystal and molecular structure of triphenylarsine" Journal of Chemical Crystallography Volume 15, Number 6 / 1985. {{doi| 10.1007/BF01164771}}
This compound is prepared by the Wurtz reaction of arsenic trichloride with chlorobenzene using sodium as the reducing agent:{{OrgSynth | author = Shriner, R. L.; Wolf, C. N. | title = Tetraphenylarsonium Chloride Hydrochloride | collvol = 4 | collvolpages = 910 | year = 1963 | prep = cv4p0910}} [http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=cv4p0910 article]
:AsCl3 + 3 PhCl + 6 Na → AsPh3 + 6 NaCl
Reactions
Reaction of triphenylarsine with lithium gives lithium diphenylarsenide and phenyllithium:{{cite book|title=cis-2-Diphenylarsinovinyldiphenylphosphine and 2-Diphenylarsinoethyldiphenylphosphine|author=W. Levason |author2=C. A. Mcauliffe |chapter=Cis -2-Diphenylarsinovinyldiphenylphosphine and 2-Diphenylarsinoethyldiphenylphosphine|series=Inorganic Syntheses|volume=16|year=1976|pages=188–192|doi=10.1002/9780470132470.ch50|isbn=978-0-470-13247-0}}
:AsPh3 + 2 Li → LiAsPh2 + LiPh
Triphenylarsine is the precursor to tetraphenylarsonium chloride, [AsPh4]Cl, a popular precipitating agent.
AsPh3 forms metal complexes with metals. Most are analogues of the corresponding triphenylphosphine derivatives. Examples include [IrCl(CO)(AsPh3)]2, [RhCl(AsPh3)3], and [Fe(CO)4(AsPh3)].{{cite book|editor=C. A. McAuliffe|title=Transition Metal Complexes of Phosphorus, Arsenic, and Antimony Ligands|publisher=J. Wiley|year=1973|isbn=0-470-58117-4}}
Tetraphenylarsonium chloride is prepared from triphenylarsine:{{cite journal |doi=10.15227/orgsyn.030.0095|title=Tetraphenylarsonium Chloride Hydrochloride|journal=Organic Syntheses|year=1950|volume=30|page=95|first1=R. L.|last1=Shriner|first2=Calvin N.|last2=Wolf}}
:(C6H5)3As + Br2 → (C6H5)3AsBr2
:(C6H5)3AsBr2 + H2O → (C6H5)3AsO + 2 HBr
: (C6H5)3AsO + C6H5MgBr → (C6H5)4AsOMgBr
:(C6H5)4AsOMgBr + 3 HCl → (C6H5)4AsCl.HCl + MgBrCl
:(C6H5)4AsCl.HCl + NaOH → (C6H5)4AsCl + NaCl + H2O