PENTA(ETHYLENE GLYCOL) DI-P-TOLUENESULFONATE

PENTA(ETHYLENE GLYCOL) DI-P-TOLUENESULFONATE Property

Boiling point:

661.4±55.0 °C(Predicted)

Density 

1.26 g/mL at 25 °C (lit.)

refractive index 

n20/D 1.524(lit.)

Flash point:

>230 °F

storage temp. 

Storage temp. 2-8°C

form 

Solid-Liquid Mixture

color 

Off-white to light brown

Water Solubility 

Not miscible or difficult to mix in water.

Sensitive 

Hygroscopic

BRN 

3599245

InChI

InChI=1S/C24H34O10S2/c1-21-3-7-23(8-4-21)35(25,26)33-19-17-31-15-13-29-11-12-30-14-16-32-18-20-34-36(27,28)24-9-5-22(2)6-10-24/h3-10H,11-20H2,1-2H3

InChIKey

BUHGDYPBQWWWQS-UHFFFAOYSA-N

SMILES

C(OS(C1=CC=C(C)C=C1)(=O)=O)COCCOCCOCCOCCOS(C1=CC=C(C)C=C1)(=O)=O

EPA Substance Registry System

3,6,9,12-Tetraoxatetradecane-1,14-diol, bis(4-methylbenzenesulfonate) (41024-91-3)

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

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.

PENTA(ETHYLENE GLYCOL) DI-P-TOLUENESULFONATE Chemical Properties,Usage,Production

Description

Tos-PEG6-Tos is a PEG linker containing two tosyl groups. The hydrophilic PEG spacer increases solubility in aqueous media. The tosyl group is a very good leaving group for nucleophilic substitution reactions.

Uses

Pentaethylene glycol di-p-toluenesulfonate is used in the preparation of calix[4]arenes, calix[5]arenes, and crown ethers. It is also used in the preparation of 3?-formylbenzo-18-crown-6 by undergoing coupling reaction with 2,3-dihydroxybenzaldehyde.

Uses

PENTA(ETHYLENE GLYCOL) DI-P-TOLUENESULFONATE is used to prepare calix[4]arenes,1 calix[5]arenes,2 and crown ethers.3

Synthesis

Pentaethylene glycol (10.8 g, 57.8 mmol) was slowly added to a stirred mixture of potassium hydroxide (7.8 g, 139.3 mmol) and ethylene glycol (60 mL) under nitrogen protection and the reaction was carried out at room temperature. Subsequently, the reaction mixture was heated to reflux temperature and stirred continuously for 36 hours. Upon completion of the reaction, it was cooled to room temperature, the reaction mixture was filtered and concentrated by depressurization to obtain a viscous oily substance. This viscous oily substance was dissolved with sodium hydroxide (4.8 g, 120 mmol) in a solution of tetrahydrofuran/water (v/v = 1/1, 40 mL) and cooled under nitrogen protection to 0°C. At this temperature, p-toluenesulfonyl chloride (22 g, 115 mmol) was slowly added. After addition, stirring was continued for 3 hours. At the end of the reaction, water (100 mL) was added to dilute the reaction mixture and the product was extracted with dichloromethane (20 mL × 3). The organic phase was washed with brine (20 mL × 3), and the combined organic layers were dried with anhydrous magnesium sulfate, followed by evaporation to remove the dichloromethane. The crude product was purified by column chromatography (petroleum ether:ethyl acetate = 3:1) to give a yellow oily pure product (8.1 g) in 27.5% yield. The product was characterized by 1H NMR (CDCl3, 500 MHz) with chemical shifts of δ 2.44 (3H, s), 3.57 (4H, s), 3.59 (2H, s), 3.67 (2H, t, J = 4.8 Hz), 4.14 (2H, t, J = 4.8 Hz), 7.33 (2H, d, J = 8.1 Hz), 7.78 (2H, d , J = 8.2 Hz).

References

[1] Bioorganic and Medicinal Chemistry, 2007, vol. 15, # 14, p. 4841 - 4856
[2] Journal of Organic Chemistry, 1999, vol. 64, # 18, p. 6870 - 6873
[3] Canadian Journal of Chemistry, 2006, vol. 84, # 10, p. 1273 - 1279
[4] Collection of Czechoslovak Chemical Communications, 1987, vol. 52, # 8, p. 2057 - 2060
[5] Russian Journal of Organic Chemistry, 2012, vol. 48, # 10, p. 1345 - 1352