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Cas Database

Name	Rhodium(II) acetate dimer	EINECS	240-084-8
CAS No.	15956-28-2	Density	N/A
PSA	105.20000	LogP	0.05520
Solubility	Soluble in aqueous solution like water. Slightly soluble in ethanol	Melting Point	205 °C
Formula	C₈H₁₂O₈Rh₂	Boiling Point	117.1 °C at 760 mmHg
Molecular Weight	441.989	Flash Point	40 °C
Transport Information	N/A	Appearance	Emerald green powder
Safety	37/39-26-15	Risk Codes	36/38
Molecular Structure		Hazard Symbols	Xi
Synonyms	Rhodiumacetate, dimer (7CI);Rhodium, tetrakis(m-acetato)di-, (Rh-Rh) (8CI);Rhodium, tetrakis[m-(acetato-O:O')]di-, (Rh-Rh);Bis(Rhodium diacetate);Dirhodium tetraacetate;Dirhodium(II)tetraacetate;NSC156310;Rhodium acetate;Rhodium diacetate dimer;Tetraacetatodirhodium;Tetraacetoxydirhodium;Tetrakis(acetato)dirhodium;Tetrakis(acetato)dirhodium(II);Tetrakis-m-(acetato)dirhodium;	Article Data	3

Rhodium(II) acetate dimer Synthetic route

: tetraacetatonitratodirhodium(II, III)

: 15956-28-2
dirhodium(II) tetraacetate

Conditions

Conditions	Yield
In water redn. of Rh2(CH3CO2)4NO3 in aq. and alcoholic solns.;

: 142-08-5
2-hydroxypyridin

: 15956-28-2
dirhodium(II) tetraacetate

: 2Rh(2+)*4C5H4NO(1-)=Rh2(C5H4N(O))4

Conditions

Conditions	Yield
In melt Rh complex and pyridine compd. are heated in a N2 atmosphere to 150°C for 72 h, prolonged heating; vac. sublimation at 90°C; elem. anal.;	90%

: 110-86-1
pyridine

: 15956-28-2
dirhodium(II) tetraacetate

: 7664-93-9
sulfuric acid

: (PyH)2[(rhodium(II))2(acetate)2(sulphate)2(pyridine)2]*H2O

Conditions

Conditions	Yield
In acetone byproducts: rhodium; mixing finely divided Rh2Ac4 with concd. H2SO4, stirring thoroughly, keeping for 1 h at 140°C, dissolving the sinter in acetone, filtn.,addn. of pyridine; filtn., washing with acetone, ethanol, and ether, elem. anal.;	60%

: 15956-28-2
dirhodium(II) tetraacetate

: 7664-93-9
sulfuric acid

: 534-17-8
caesium carbonate

: (caesium)2[(rhodium(II))2(acetate)2(sulphate)2(H2O)2]*3H2O

Conditions

Conditions	Yield
In water treating Rh2Ac4 with H2SO4, heating for 3-4 h to 140°C, dissolving in acetone, filtn., evapn. to dryness, dissolving in water, addn., ofCs2CO3, passing argon through the soln.; evapn., dissolving in water, salting-out with alcohol, filtn., washing with alcohol and ether, elem. anal.;	50%

: 15956-28-2
dirhodium(II) tetraacetate

: 7664-93-9
sulfuric acid

: 497-19-8
sodium carbonate

: Na4[(rhodium(II))2(sulphate)4(H2O)2]*5.5 H2O

Conditions

Conditions	Yield
byproducts: rhodium; mixing Rh2Ac4 with H2SO4, keeping for 1 h at 140°C, treating with H2SO4 at 140°C for 10 h, addn. of water, filtn., addn. of Na2CO3 soln., evapn., treating with H2SO4 at 140°C for 10-12 h, dissolving in water, addn. of Na2CO3 soln.; filtn., washing with water, alcohol, and ether, elem. anal.;	40%

: 15956-28-2
dirhodium(II) tetraacetate

: 130525-39-2
2,7-di-t-butyl-9,9-dimethyl-4,5-xanthenedicarboxylic acid

A: Rh4(CH3COO)3((COOC6H2C4H9)2OC(CH3)2)2(COOC6H2C4H9)2HOC(CH3)2

B: Rh4(CH3COO)2((COOC6H2C4H9)2OC(CH3)2)2((COOC6H2C4H9)2HOC(CH3)2)2

C: 327601-09-2, 327601-11-6
Rh4(CH3COO)4((COOC6H2C4H9)2OC(CH3)2)2

Conditions

Conditions	Yield
In further solvent(s) ligand and Rh-complex were stirred in N,N-dimethylaniline at 140°C for 24 h, cooled, diluted in CH2Cl2, MeCN was added under Ar; washed with aq. HCl, water, organic layer was dried, evapd., chromd. acetone-CH2Cl2; elem. anal.;	A 33% B 7% C 40%

: 15956-28-2
dirhodium(II) tetraacetate

: 130525-39-2
2,7-di-t-butyl-9,9-dimethyl-4,5-xanthenedicarboxylic acid

A: Rh4(CH3COO)3((COOC6H2C4H9)2OC(CH3)2)2(COOC6H2C4H9)2HOC(CH3)2

B: Rh4(CH3COO)6((COOC6H2C4H9)2OC(CH3)2)

C: 327601-09-2, 327601-11-6
Rh4(CH3COO)4((COOC6H2C4H9)2OC(CH3)2)2

Conditions

Conditions	Yield
In further solvent(s) ligand and Rh-complex were stirred in N,N-dimethylaniline at 140°C for 24 h, cooled, diluted in CH2Cl2 under Ar; washed with aq. HCl, water, organic layer was dried, evapd., chromd. MeOH-CH2Cl2; elem. anal.;	A 5% B 32% C 24%

: 15956-28-2
dirhodium(II) tetraacetate

: 2857-97-8
trimethylsilyl bromide

: Rh2Br4(μ-Br)2(μ-dppm)2*C6H5CH3

Conditions

Conditions	Yield
In toluene (Ar); Rh compd. and Me3SiBr in toluene were stirred at ambient temp. for 14 h; formed pptn. was filtered off, filtrate was allowed to evaporate slowly in air, red crystals were obtained after 1 week;	6%

: 15956-28-2
dirhodium(II) tetraacetate

: 102746-28-1
Rh2(CH3COO)4(CO)

Conditions

Conditions	Yield
With carbon monoxide In further solvent(s) reaction at 1 atm CO and 0°C in C2H4Cl2; UV;

: 15956-28-2
dirhodium(II) tetraacetate

: 7664-93-9
sulfuric acid

: 584-08-7
potassium carbonate

: K4[(rhodium(II))2(sulphate)4(H2O)2]*4H2O

Conditions

Conditions	Yield
byproducts: rhodium; mixing finely divided Rh2Ac4 with concd. H2SO4, stirring thoroughly, keeping for 1 h at 140°C, finely dividing the resulting sinter, treating with H2SO4 at 140°C for 10 h, dissolving in water, filtn., neutralisation with concd. K2CO3 soln.; filtn., washing with water, alcohol, and ether, elem. anal.;	20-30

Rhodium(II) acetate dimer Specification

The Rhodium(II) acetate dimer, with the CAS registry number 15956-28-2 and EINECS registry number 226-843-6, has the systematic name of rhodium(2+) acetate (1:2). It is a kind of emerald green powder, and belongs to the following product categories: Catalysts for Organic Synthesis; Classes of Metal Compounds; Homogeneous Catalysts; Metal Complexes; Rh (Rhodium) Compounds; Synthetic Organic Chemistry; Transition Metal Compounds. And the molecular formula of this chemical is C₈H₁₂O₈Rh₂. What's more, it is usually used as homogeneous catalyst in the cyclopropanation of olefins and enol ethers.

The physical properties of Rhodium(II) acetate dimer are as followings: (1)ACD/LogP: -0.29; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -1.07; (4)ACD/LogD (pH 7.4): -2.86; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 2.73; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 2; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 37.3 Å²; (13)Flash Point: 40 °C; (14)Enthalpy of Vaporization: 23.7 kJ/mol; (15)Boiling Point: 117.1 °C at 760 mmHg; (16)Vapour Pressure: 13.9 mmHg at 25°C.

Preparation: Dissolve the Rh(OH)₃^.H₂O with glacial acetic acid, and you can get the deep emerald green solution. Heat the solution, and after reduced pressure distillation, the acetic acid is get off from the solution. And through acetone extraction, the solution become colorless, and then filter with sand core funnel. After a series of evaporating concentration, cooling crystallization and washing, you can get the Rhodium(II) acetate dimer.

You should be cautious while dealing with this chemical. It irritates to eyes and skin. Therefore, you had better take the following instructions: Keep away from heat; Wear suitable gloves and eye/face protection, and in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: [Rh+2].[Rh+2].O=C([O-])C.[O-]C(=O)C.[O-]C(=O)C.[O-]C(=O)C
(2)InChI: InChI=1/4C2H4O2.2Rh/c4*1-2(3)4;;/h4*1H3,(H,3,4);;/q;;;;2*+2/p-4
(3)InChIKey: SYBXSZMNKDOUCA-XBHQNQODAN

The toxicity data is as follows:

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
mouse	LD10	intraperitoneal	115mg/kg (115mg/kg)		Journal of Medicinal Chemistry. Vol. 20, Pg. 943, 1977.

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