1,5-Bis(diphenylphosphino)pentane

1,5-Bis(diphenylphosphino)pentane Property

Melting point:

43-47 °C (lit.)

Boiling point:

230 C

Flash point:

>230 °F

storage temp. 

Inert atmosphere,Room Temperature

solubility 

Soluble in N,N-dimethyl formamide.

form 

Powder to Crystals or Chunks

color 

White to light yellow

BRN 

2953640

CAS DataBase Reference

27721-02-4(CAS DataBase Reference)

Safety

Hazard Codes 

Xi,F

Risk Statements 

36/37/38-10

Safety Statements 

26-37/39-36-16

WGK Germany 

3

F 

10-23

TSCA 

No

HS Code 

29319090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

1,5-Bis(diphenylphosphino)pentane Chemical Properties,Usage,Production

Chemical Properties

white to light yellow crystal powde

Uses

1,5-Bis(diphenylphosphino)pentane is used as a ligand for the cross coupling reactions. It is used in the manufacturing of glass bottle PTFE bottle, aluminum foil bag and in cardboard drum. combination of a 1,5-bis(diphenylphosphino)pentane ligand and the addition of N,N,N?,N?-tetramethylethylenediamine (TMEDA) as a co-catalyst are the key factors in obtaining the corresponding aryl nitriles with improved catalyst productivities and selectivities.

reaction suitability

reaction type: Buchwald-Hartwig Cross Coupling Reaction
reaction type: Heck Reaction
reaction type: Hiyama Coupling
reaction type: Negishi Coupling
reaction type: Sonogashira Coupling
reaction type: Stille Coupling
reaction type: Suzuki-Miyaura Coupling
reagent type: ligand

Synthesis

In a 2-liter four-necked flask equipped with an effective condenser, stirrer, and dropping funnel, 500 mL of anhydrous tetrahydrofuran (THF) was added and deoxygenated by drying nitrogen for 1 hour. Subsequently, 100 g (0.382 mol) of triphenylphosphine was added and the mixture was stirred until a clarified solution was formed. During this process, 6 g (0.856 mol) of freshly prepared, ultrafine lithium rinsed with THF was added in small amounts in batches while keeping the reaction temperature below 50 °C to control the exothermic nature of the reaction. After the lithium addition was completed, the resulting dark red solution was cooled to 0 °C and a THF solution (50 mL) of 50 g (0.442 mol) of 1,5-dichloropentane was prepared and similarly cooled to 0 °C. This solution was added dropwise to the reaction mixture, keeping the temperature at 0°C. Upon completion of the dropwise addition, the color of the reaction mixture changed to light brown. Subsequently, the mixture was refluxed at 80°C for 3 hours. After completion of the reaction, it was cooled to room temperature and 750 ml of deoxy methanol was added. The mixture was again cooled to 0 °C and 125 ml of oxygen-free water was added rapidly and dropwise to the vigorously stirred mixture. After standing at 0 °C for some time, the upper solution was decanted. The residue was filtered under nitrogen protection, washed with 5 x 25 ml of cold ether and dried under vacuum for 20 hours. 29.4 g (35% yield as triphenylphosphine) of 1,5-bis(diphenylphosphino)pentane was finally obtained as a white amorphous powder with a melting point of 41-44 °C, which is consistent with literature data. The 1H and 31P NMR spectra of the product were consistent with the structure, and the data are listed in Table 3.If the synthesis is carried out using undeoxygenated methanol and water, the oxidation of 1,5-bis(diphenylphosphino)pentane to 1,5-bis(diphenylphosphino)pentoxide is observed, at which point the product is a caramelized, amorphous mixture, which needs to be separated by graded recrystallization from the mixed benzene/methanol solvent.

References

[1] Journal of Organometallic Chemistry, 2011, vol. 696, # 10, p. 2238 - 2251