Дихлорэтилфосфин

Description

Dichloroethylphosphine (ethyldichlorophosphine) is a reactive chlorophosphine with an ethyl substituent at the phosphorus atom, a colorless liquid.

Basic Attributes

• CAS No.: 1498-40-4
• Chemical formula: C2H5Cl2P
• Molecular weight: 130.94; exact mass 130.94
• EU number: 216-096-4
• UN number: 2845
• DSSTox ID: DTXSID4075291
• HS code: 29310099
• PSA Features: 0
• XLogP3: 2.7958

Physico-chemical characteristics

• Appearance: colorless liquid
• Density: 1.2485 g/cm3 at 23 °C
• Boiling point: 113–116 °C at 760 Torr pressure
• Flash point: 91°F (about 33°C)
• Refractive index: n20/D 1.495 (according to literature data)
• Solubility in water: highly flammable, reacts with water

Reactivity

Pyrophoric reagent: spontaneously ignites on contact with water or air moisture. In water it decomposes to form hydrochloric acid, the reaction products cause corrosion. The chlorine atoms of phosphorus are easily replaced by nucleophiles, which makes the substance the starting reagent for the synthesis of ethylphosphorus derivatives. In terms of stability in air, it is close to dichloromethylphosphine - both reagents are pyrophoric and require strictly anhydrous storage conditions and operation under an inert atmosphere.

Scope of application

Reagent for the synthesis of ethylphosphines, ethylphosphine oxides, ethylphosphonic acids and their esters - intermediate products of organophosphorus chemistry, similar in function to methyl and isopropyldichlorophosphines, but with an ethyl substituent at phosphorus.

Place in the series of alkyldichlorophosphines

The ethyl substituent occupies a position between the methyl (smallest in volume) and the more branched isopropyl and tert-butyl substituents in the series of alkyldichlorophosphines, providing a moderate steric load of the resulting organophosphorus products while maintaining the high reactivity of P-Cl bonds.

Safety Information

• UN number: 2845
• WGK Germany: 3
• Hazard class code: 34-29-23/24/25-17-14-10 (by analogy with related alkyldichlorophosphines given in the general source list)

Identification

Synonyms: ethyl phosphorus dichloride, dichlorethyl phosphine, ethylphosphone dichloride, ethyldichlorophosphine, ethylphosphorus dichloride. All names refer to the same compound CAS 1498-40-4. The ethyl substituent occupies an intermediate position between the methyl and more branched alkyl groups in the series of alkyldichlorophosphines.

Storage and transportation conditions

Store in an ignition zone (isolated from sources of heat and open flame), in an airtight container, away from moisture and water. Pyrophoricity and the ability to react violently with water require working with respiratory and skin protection similar to that used when handling the related dichloromethylphosphine.