PALLADIUM (II) ACETATE

Palladium (II) Acetate is a chemical compound of palladium described by the formula [Pd(O2CCH3)2]n, abbreviated [Pd(OAc)2]n.
Palladium (II) Acetate is more reactive than the analogous platinum compound. Depending on the value of n, the compound is soluble in many organic solvents and is commonly used as a catalyst for organic reactions.
Palladium(II) acetate is a chemical compound composed of palladium and acetate ligands, with the chemical formula Pd(OAc)₂, where OAc represents the acetate group (CH₃COO⁻). 

CAS Number: 3375-31-3
Molecular Formula: Pd(CH3COO)2
Molecular Weight: 224.51
EINECS Number: 222-164-4

Synonyms: Palladium (II) acetate, RefChem:858312, palladium(2+) diacetate, acetic acid;palladium, palladium acetate-, SCHEMBL17964, palladium(ii) acetate, trimer, Palladium(II) acetate, 98%, SCHEMBL30125186, BBL100060, STL511032, AKOS016015615, BP-11459, Palladium(II) acetate, Pd 45.9-48.4%, Palladium(II) acetate, reagent grade, 98%, Palladium(II) acetate, recrystallized, 97%, Palladium(II) acetate, purum, 47% Pd basis, Palladium(II) acetate, 99.98% trace metals basis, Palladium(II) acetate, min. 98% (99.9+%-Pd), Palladium(II) acetate, >=99.9% trace metals basis, Palladium(II) acetate, Vetec(TM) reagent grade, 98%, F0001-0990, Palladium (II) acetate, >=99.95% Trace metals grade, Palladium(II) acetate, ChemDose(TM) tablets, Loading: 10mumol per tablet, Palladium(II) acetate, ChemDose(TM) tablets, Loading: 2mumol per tablet, ACETIC ACID PALLADIUM(II) SALT;PALLADIUM ACETATE;PALLADIUM(+2)ACETATE;PALLADIUM DIACETATE;PALLADIUM(II) ACETATE;PALLADIUM(II) ACETATE IN IONIC LIQUID ON SILICA;Pd(OAC)2 (=Palladium Acetate);PALLADIUM (II) ACETATE, TRIMER

Palladium (II) Acetate is a coordination complex in which each palladium atom is bonded to two acetate ligands, and in its most common form, it exists as a trimeric structure, meaning three palladium atoms are connected through bridging acetate groups, forming a cyclic arrangement. 
This trimeric structure is thermally stable yet reactive, which makes palladium(II) acetate a highly useful compound in a wide variety of chemical reactions.
Palladium (II) Acetate is typically a dark brown to dark red solid, and it is sparingly soluble in water but dissolves readily in organic solvents such as chloroform, benzene, and acetonitrile, which facilitates its use in organic synthesis. 

Chemically, Palladium (II) Acetate is classified as a transition metal carboxylate complex, and it acts as a versatile catalyst due to the palladium center’s ability to undergo oxidation-reduction cycles, coordinate to unsaturated organic molecules, and facilitate bond-forming reactions.
Brown needles, soluble in benzene and toluene, insoluble in ether and alcohol, keep in dark and refrigerated.
Palladium (II) Acetate is a chemical compound of palladium. 

Palladium (II) Acetate is used as a catalyst for many organic reactions and as a precursor to other palladium(II) compounds. 
Palladium (II) Acetate is a chemical element with the chemical symbol Pd and an atomic number of 46. 
It is found as a free metal alloyed with gold and other platinum group metals and in the rare minerals cooperite and polarite. 

Palladium(II) acetate is a homogenous oxidation catalyst. 
Palladium (II) Acetate participates in the activation of alkenic and aromatic compounds towards oxidative inter- and intramolecular nucleophilic reactions. 
Crystals of palladium(II) acetate have a trimeric structure, having symmetry D3h. 

Each of the palladium atoms in the crystals are joined to the other two by double acetate bridges. 
Microencapsulation of palladium(II) acetate in polyurea affords polyurea-encapsulated palladium(II) acetate. 
Palladium (II) Acetate is a versatile heterogeneous catalyst for various phosphine-free cross-coupling reactions. 

Palladium (II) Acetate participates as catalyst in the Heck coupling reaction of pthalides with different alkenes.
The general procedure for the synthesis of palladium acetate from palladium carbon and glacial acetic acid is as follows: Recovered palladium powder (10.3 g, 0.9 eq.) is added to a mixture of glacial acetic acid (200 ml) and nitric acid (0.5 ml), followed by refluxing the reaction for 30 minutes. 
After completion of the reaction, the brown solution was obtained by filtration while hot. 

The filtrate was concentrated until about 20 ml of glacial acetic acid remained and stopped. 
Palladium (II) Acetate crystals gradually precipitated at the bottom of the beaker at room temperature. 
The recovered palladium acetate (20 g, 92% yield) was finally obtained by diafiltration operation.

Palladium (II) Acetate recrystallises from CHCl3 as purple crystals. 
It can be washed with AcOH and H2O and dried in air, large crystals are obtained by dissolving it in *C6H6, adding half its volume of AcOH and allowing it to evaporate slowly at room temperature. 
Palladium (II) Acetate forms green adducts with nitrogen donors, it dissolves in KI solution to form solid PdI2 and a red solution of PdI42-, but is insoluble in aqueous saturated NaCl, and NaOAc. 

Palladium (II) Acetate dissolves in HCl to form PdCl42-. 
It is soluble in CHCl3, CH2Cl2, Me2CO, MeCN, Et2O, but it is insoluble in H2O, and decomposes when warmed in alcohols in which it is also insoluble. 
With a 1:2 stoichiometric ratio of palladium atoms and acetate ligands, the compound exists as molecular and polymeric forms with the trimeric form being the dominant form in the solid state and in solution. 

Pd achieves approximate square planar coordination in both forms.
As prepared by Geoffrey Wilkinson and coworkers in 1965 and later characterized by Skapski and Smart in 1970 by single crystal X-ray diffraction, palladium(II) acetate is a red-brown solid that crystallizes as monoclinic plates. 

Palladium (II) Acetate has a trimeric structure, consisting of an equilateral triangle of Pd atoms each pair of which is bridged with two acetate groups in a butterfly conformation.
Palladium(II) acetate can also be prepared as a pale pink form. According to X-ray powder diffraction, this form is polymeric.

Melting point: 205 °C
Vapor pressure: 0.002 Pa at 25℃
Storage temp.: Store below +30°C
Solubility: Soluble as monomer in glacial acetic acid or as trimer in benzene
Form: Various Forms In Red-(Powder/Flake/Crystalline/Beads)
Color: Red-brown
pH Range: 2.0 - 3.0 at 20 °C
pH: 2-3 (H2O, 20℃)(aqueous suspension)
Water Solubility: Insoluble
Sensitive: Hygroscopic
Hydrolytic Sensitivity: 4 (no reaction with water under neutral conditions)
λmax: 400 nm (EtOH)(lit.)
Merck: 14,6991
BRN: 6086766
InChIKey: PCUVQHHZCJMCHO-UHFFFAOYSA-M
LogP: -0.17 at 20℃

Palladium(II) acetate, in trimeric form, can be prepared by treating palladium sponge with a mixture of acetic acid and nitric acid. 
An excess of palladium sponge metal or nitrogen gas flow are required to prevent contamination by the mixed nitrito-acetate (Pd3(OAc)5NO2).
Pd + 4 HNO3 → Pd(NO3)2 + 2 NO2 + 2 H2O

Pd(NO3)2 + 2 CH3COOH → Pd(O2CCH3)2 + 2 HNO3
Relative to the trimeric acetate, the mixed nitrate-acetate variant has different solubility and catalytic activity. 
Preventing, or controlling for the amount of, this impurity can be an important aspect for reliable use of palladium(II) acetate.

Palladium(II) acetate is prepared analogously; other carboxylates are prepared by treating palladium(II) acetate with the appropriate carboxylic acid.
Likewise, Palladium(II) acetate can be prepared by treating other palladium(II) carboxylates with acetic acid. 
This ligand exchange starting with a purified other carboxylate is an alternative way to synthesize palladium(II) acetate free from the nitro contaminant.

Palladium(II) acetate is prone to reduction to Pd(0) in the presence of reagents which can undergo beta-hydride elimination such as primary and secondary alcohols as well as amines. 
When warmed with alcohols, or on prolonged boiling with other solvents, palladium(II) acetate decomposes to palladium.
Palladium(II) acetate is most prominently used as a catalyst in homogeneous catalysis, particularly in reactions such as Heck, Suzuki, and Stille cross-coupling reactions, where it helps form carbon-carbon and carbon-heteroatom bonds efficiently. 

Its ability to activate alkenes, alkynes, and aryl halides makes it indispensable in modern organic synthesis, pharmaceuticals, and fine chemical production. 
Beyond coupling reactions, it can also act as a catalyst for oxidation reactions, including the transformation of alcohols to aldehydes or ketones under controlled conditions.
Palladium(II) acetate is a trimeric palladium complex with acetate ligands that is highly valued in chemistry for its catalytic properties, enabling numerous synthetic transformations in organic and industrial chemistry, particularly those involving bond formation between carbon atoms or between carbon and heteroatoms. 

Its combination of stability, solubility in organic solvents, and high reactivity as a transition metal catalyst makes it a cornerstone in both laboratory and industrial organic chemistry.
Palladium(II) acetate is a highly versatile organometallic compound in which the palladium atom exists in the +2 oxidation state, coordinated to acetate groups that act as ligands stabilizing the metal center. 
Its most common trimeric form, often described as [Pd(OAc)₂]₃, consists of three palladium atoms linked by bridging acetate ligands in a cyclic arrangement, which provides both structural stability and reactive sites for catalytic processes. 

This trimeric form is particularly important because it dissociates in solution to generate monomeric palladium species, which are the active catalytic forms in most reactions.
The ability to generate these reactive species under mild conditions is one reason why palladium(II) acetate is so widely used in organic chemistry.
Physically, it is a dark red to brown crystalline solid, with limited solubility in water but good solubility in organic solvents such as chloroform, dichloromethane, acetone, and acetonitrile, allowing it to be easily incorporated into homogeneous reaction systems. 

Chemically, palladium(II) acetate is highly reactive due to the electron-deficient nature of the palladium center, which can coordinate to alkenes, alkynes, aryl halides, and other unsaturated organic molecules. 
This reactivity enables it to act as a precursor for a wide variety of palladium-catalyzed transformations, including cross-coupling reactions, carbonylations, and oxidative transformations.

Uses Of Palladium(II) acetate:
Palladium(II) acetate is used in Suzuki-Miyaura cross-coupling reactions and a catalyst for intramolecular coupling. 
It also serves to catalyze the chemoselective reduction of nitroarenes.
Palladium(II) acetate is primarily used as a catalyst in organic synthesis, and its applications span both laboratory-scale reactions and large-scale industrial processes due to its ability to facilitate a wide variety of bond-forming transformations. 

One of its most important uses is in cross-coupling reactions, including Heck, Suzuki-Miyaura, Stille, Sonogashira, and Negishi reactions, which allow chemists to efficiently form carbon-carbon bonds between aryl, vinyl, or alkyl groups. 
These reactions are essential in the synthesis of pharmaceuticals, agrochemicals, natural products, and fine chemicals, where precise formation of molecular frameworks is critical.

In addition to cross-coupling, palladium(II) acetate is also extensively employed in oxidation reactions, where it catalyzes the transformation of alcohols to aldehydes or ketones, as well as other oxidative processes such as Wacker-type oxidations of alkenes, which are important in both academic research and industrial chemical production. 
Its ability to coordinate to unsaturated molecules, activate C-H bonds, and stabilize reaction intermediates makes it invaluable for C-H functionalization reactions, enabling chemists to directly modify otherwise inert carbon-hydrogen bonds without the need for pre-functionalized starting materials.

Beyond traditional organic synthesis, palladium(II) acetate is also used in material science, particularly in the preparation of palladium-containing nanoparticles, conductive polymers, and advanced catalytic materials. 
These materials are important in applications such as electronic devices, fuel cells, and heterogeneous catalysis, where the palladium center provides both reactivity and selectivity for specific chemical transformations. 
Furthermore, its role as a precursor to other palladium catalysts—including complexes with phosphine ligands or supported palladium systems—makes it a key starting material in catalyst development for specialized chemical reactions.

In industrial applications, palladium(II) acetate is also employed in fine chemical and pharmaceutical manufacturing to increase the efficiency, selectivity, and yield of critical synthetic steps. 
Its combination of solubility in organic solvents, thermal stability, and the ability to generate reactive monomeric palladium species in situ makes it particularly suited for homogeneous catalysis, where controlled reaction environments and reproducible results are required.

Palladium(II) acetate is a highly versatile and widely used palladium catalyst that enables cross-coupling, oxidation, and C-H functionalization reactions, as well as serving as a precursor to advanced materials and other catalytic systems, making it indispensable in modern organic synthesis, pharmaceutical production, and materials chemistry.
Palladium(II) acetate is widely regarded as one of the most versatile and essential catalysts in modern organic chemistry due to its ability to mediate a broad spectrum of chemical transformations with high efficiency and selectivity. 

Its primary use is in homogeneous cross-coupling reactions, such as the Heck reaction, Suzuki-Miyaura reaction, Stille coupling, Sonogashira coupling, and Negishi coupling, where it facilitates the formation of carbon-carbon bonds between aryl, vinyl, or alkyl moieties, often under relatively mild reaction conditions. 
These transformations are particularly important in the pharmaceutical industry, where the construction of complex molecular frameworks is critical for the development of active pharmaceutical ingredients (APIs), and in the agrochemical industry, where selective bond formation is required for the synthesis of herbicides, pesticides, and fungicides.

In addition to its cross-coupling applications, palladium(II) acetate is heavily utilized in oxidation reactions, where it catalyzes the conversion of primary and secondary alcohols into aldehydes and ketones, as well as more complex oxidative transformations such as the Wacker oxidation of alkenes to ketones. 
These reactions are widely employed not only in laboratory research but also in industrial-scale processes, where palladium(II) acetate enables highly selective functionalization of organic molecules, thereby reducing the need for multi-step procedures and improving overall synthetic efficiency. 
Its ability to activate otherwise inert C-H bonds makes it a valuable catalyst for C-H functionalization, a process that allows chemists to directly introduce functional groups into hydrocarbons, streamlining the synthesis of complex molecules and minimizing waste.

Palladium(II) acetate is also used in materials science and nanotechnology, where it serves as a precursor for the preparation of palladium nanoparticles, supported palladium catalysts, and conductive polymer composites. 
These materials have applications in fuel cells, hydrogenation reactions, electronic devices, and heterogeneous catalysis, demonstrating the compound’s versatility beyond solution-phase reactions. 
In addition, it is frequently employed to generate other palladium complexes, including phosphine-ligated catalysts or immobilized palladium systems, which are used to tailor reactivity, selectivity, and stability for specific industrial and laboratory applications.

Safety Profile Of Palladium(II) acetate:
Palladium(II) acetate is a dark red to brown crystalline solid that is sparingly soluble in water but readily soluble in organic solvents such as chloroform, acetone, and acetonitrile. 
It is chemically reactive, particularly with strong reducing agents, strong acids, and bases, which can lead to decomposition, release of toxic fumes, or hazardous reactions.
Although not highly flammable itself, it is often handled in organic solvent systems that are flammable, so care must be taken to avoid ignition sources. 

Palladium(II) acetate can also release palladium metal or other palladium species under certain conditions, which may present additional reactivity risks.
Palladium(II) acetate can cause severe irritation to the skin, eyes, and respiratory tract. 
Direct contact may result in dermatitis or eye damage, while inhalation of dust or vapors can lead to coughing, shortness of breath, or respiratory discomfort. 

Prolonged or repeated exposure can result in sensitization, meaning that even small exposures in the future could trigger allergic reactions. 
Animal studies indicate that certain palladium compounds may have toxic effects if ingested, though specific human toxicity data are limited. 
Palladium(II) acetates are also considered potential carcinogens and mutagens, particularly with chronic exposure, which underscores the importance of minimizing contact.

Palladium(II) acetate is toxic to aquatic life and can persist in the environment if not properly contained. Releases into water or soil can lead to bioaccumulation in aquatic organisms and potentially disrupt ecosystems. 
Proper disposal and containment are essential to prevent environmental contamination, and waste streams containing palladium should be treated according to regulatory guidelines.