1,2-Bis(diphenylphosphino)ethylene

cis-1,2-Bis(diphenylphosphino)ethylene (dppv) is an organophosphorus compound with the formula C₂H₂(PPh₂)₂ (Ph = C₆H₅). Both the cis and trans isomers are known, but the cis isomer is of primary interest. Classified as a diphosphine ligand, it is a bidentate ligand in coordination chemistry. For example it gives rise to the complex Ni(dppv)₂ and the coordination polymer [Ni(dppv)]_n.^[1] As a chelating ligand, dppv is very similar to 1,2-bis(diphenylphosphino)benzene.

Quick facts Names, Identifiers ...

1,2-Bis(diphenylphosphino)ethylene

cis isomer
Names
Preferred IUPAC name [(Z)-Ethene-1,2-diyl]bis(diphenylphosphane)
Identifiers
CAS Number	983-80-2 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL2114057
ChemSpider	2015214
ECHA InfoCard	100.012.336
EC Number	213-569-7
PubChem CID	2733415
CompTox Dashboard (EPA)	DTXSID601283879
InChI InChI=1S/C26H22P2/c1-5-13-23(14-6-1)27(24-15-7-2-8-16-24)21-22-28(25-17-9-3-10-18-25)26-19-11-4-12-20-26/h1-22H/b22-21- Key: NCKJIJSEWKIXAT-DQRAZIAOSA-N
SMILES C1=CC=C(C=C1)P(/C=C\P(C2=CC=CC=C2)C3=CC=CC=C3)C4=CC=CC=C4
Properties
Chemical formula	C26H22P2
Molar mass	396.410 g·mol−1
Appearance	white solid
Melting point	125 Â°C (257 Â°F; 398 K)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 Â°C [77 Â°F], 100 kPa). Infobox references

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The diphosphine is prepared by reaction of lithium diphenylphosphide with cis-dichloroethylene.^[2]

2 LiPPh₂ + C₂H₂Cl₂ → C₂H₂(PPh₂)₂ + 2 LiCl

trans-1,2-Bis(diphenylphosphino)ethylene is made similarly, but using trans-dichloroethylene.