Allylpalladium chloride dimer

Allylpalladium(II) chloride dimer

Names
IUPAC name Allylpalladium(II) chloride dimer
Other names Allylpalladium chloride dimer bis(allyl)di-μ-chloro-dipalladium(II) APC
Identifiers
CAS Number	12012-95-2
ChemSpider	21171401
Jmol interactive 3D	Image
InChI InChI=1S/2C3H5.2ClH.2Pd/c2*1-3-2;;;;/h2*3H,1-2H2;2*1H;;/q;;;;2*+1/p-2 Key: TWKVUTXHANJYGH-UHFFFAOYSA-L InChI=1/2C3H5.2ClH.2Pd/c2*1-3-2;;;;/h2*3H,1-2H2;2*1H;;/q;;;;2*+1/p-2/r2C3H5ClPd/c2*1-2-3-5-4/h2*2H,1,3H2 Key: TWKVUTXHANJYGH-NNVIZEFPAF
SMILES Cl[Pd]CC=C.C=CC[Pd]Cl
Properties
Chemical formula	C6H10Cl2Pd2
Molar mass	365.85 g/mol
Appearance	Pale yellow, crystalline solid
Density	Solid
Melting point	decomp at 155-156 °C
Solubility in water	Insoluble
Solubility in other solvents	Chloroform benzene acetone methanol
Hazards
Safety data sheet	http://www.colonialmetals.com/pdf/5048.pdf
R-phrases	36/37/38
S-phrases	26-36
Related compounds
Related compounds	(η^3-allyl)(η5 – cyclopentadienyl)palladium(II) di-μ-chlorobis(crotyl)dipalladium
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

Allylpalladium(II) chloride dimer is a chemical compound with the formula (η³- C₃H₅)₂Pd₂Cl₂. This yellow air-stable compound is an important catalyst used in organic synthesis.^[1]

Synthesis and reactions

The compound is prepared by purging carbon monoxide through a methanolic aqueous solution of palladium(II) chloride, sodium chloride, and allyl chloride.^[1]

2Na₂PdCl₄ + 2 CH₂=CHCH₂Cl + 2 CO + 2 H₂O → (C₃H₅)₂Pd₂Cl₂ + 4 NaCl + 2 CO₂ + 4 HCl

APC reacts with sources of cyclopentadienyl anion to give the corresponding 18e complex cyclopentadienyl allyl palladium:

(C₃H₅)₂Pd₂Cl₂ + 2 NaC₅H₅ → 2 Pd(η³-C₃H₅)(η⁵-C₅H₅) + 2 NaCl

References

1. Tatsuno, Y.; Yoshida, T.; Otsuka, S. "(η³-allyl)palladium(II) Complexes" Inorganic Syntheses, 1990, volume 28, pages 342-345. ISBN 0-471-52619-3