Diisopropyl Phosphite CAS 1809-20-7

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Diisopropyl phosphite is a colorless liquid of chemical formula C6H15O3P and CAS 1809-20-7. Corrosive, soluble in ethanol and other organic solvents. Diisopropyl phosphit is a special pesticide intermediate, which can be used to prepare the organophosphorus fungicide isopyrimidine through the synthesis of O, O-diisopropyl thio (alcohol) ammonium phosphate. With its unique chemical structure and reactivity, it has become an important bridge connecting pesticides, medicine, and materials science. With the development of green chemistry and precision synthesis technology, their applications in high-end manufacturing and life and health fields will be further deepened, providing key support for the upgrading of the global chemical industry.

Diisopropyl phosphite (chemical formula C6H15O3P, CAS number 1809-20-7) is an important organic phosphorus compound. It is a transparent and colorless liquid at room temperature and is soluble in water and most organic solvents. The phosphorus atom in its molecular structure exists in a+3 valence state, and two isopropoxy groups (- OCH (CH3) ₂) are connected to phosphorus through a single bond, while the remaining hydroxyl group (- OH) endows it with reactivity. Due to its unique chemical properties, this compound has demonstrated extensive application value in fields such as pesticides, pharmaceuticals, and materials science.

Core applications in the field of pesticides

 

1. Synthesis of Organophosphorus Fungicide Imidacloprid
It is a key intermediate for the production of the organic phosphorus fungicide, Yidawen Jing. Its synthetic pathway involves reacting with triphenyl thiophosphate to generate O, O-diisopropylthio (alcohol) ammonium phosphate, which is then converted into isopyruvic acid. As an endophytic fungicide, Yidao Wenjing has significant control effects on fungal diseases such as rice blast and sheath blight, and is widely used in rice growing areas in Asia.

Optimization of synthesis process:

Traditional method: Using phosphorus trichloride (PCl ∝) and isopropanol as raw materials, diisopropyl phosphit is generated through esterification reaction in benzene solvent. The reaction temperature needs to be controlled at 40-60 ℃ to avoid the formation of by-products.

 

Improved process: Petroleum ether (30-60 ℃) is used as the solvent, and potassium carbonate is added as the acid binding agent. Under nitrogen protection, the reaction yield can reach 87% and the purity exceeds 99%. This method reduces the use of toxic solvents and is in line with the trend of green chemistry.

2. Anti wear lubricant additives
After compounding diisopropyl phosphit with triphenyl thiophosphate, it can be used as an anti-wear lubricant additive on the surface of T8 steel/Al ₂ O3 ceramics. Its mechanism of action is that phosphorus element forms a chemical adsorption film with the metal surface, reducing the friction coefficient. Experimental data shows that adding 5% diisopropyl phosphit to lubricating oil can reduce wear by 40%, making it suitable for lubricating high load mechanical components.

Innovation breakthroughs in the field of medicine

 

1. Synthesis of intermediates in the southern side chain of Etapepti
Etapenem is a broad-spectrum carbapenem antibiotic, and the synthesis of its side chain intermediate N - (O, O-diisopropylphosphoryl) trans-4-hydroxy-L-proline depends on diisopropyl phosphit. This process adopts phase transfer catalysis technology, using 4R-hydroxy-L-proline as raw material, reacting with diisopropyl phosphit under alkaline conditions, and then adding a mixed solution of sodium hypochlorite/sodium hydroxide dropwise to complete oxidation. The advantage of this method is that:

Mild reaction conditions: no strict temperature control required, can be completed at room temperature;
High yield: The purity of the target product reaches 98%, and the yield exceeds 85%;

 

Easy to operate: One pot reaction reduces intermediate separation steps, suitable for industrial production.

2. Development of antiviral drug intermediates
Huangshi Fuertai Pharmaceutical Technology Co., Ltd. utilizes proprietary intellectual property technology to synthesize the key intermediate of Tenofovir (an anti HIV drug) using diisopropyl phosphite. In its synthetic route, diisopropyl phosphit acts as a phosphorylating reagent and reacts with nucleoside compounds to produce phosphorylated products, which are then oxidized and hydrolyzed to obtain the target intermediate. This process significantly improves reaction selectivity and reduces the generation of toxic by-products.

Functional Expansion in Materials Science

 

1. Surface modification of ceramic materials
Diisopropyl phosphit can form a phosphoryl modified layer on the surface of Al ₂ O3 ceramics through chemical deposition, enhancing the bonding strength between ceramics and metal substrates. Experiments have shown that the treated ceramic/metal composite material has a 30% increase in interfacial shear strength, making it suitable for high-temperature structural components in the aerospace industry.

2. Precursors for the synthesis of optoelectronic materials
In the development of organic light-emitting devices (OLEDs), diisopropyl phosphit serves as a ligand precursor for phosphorescent complexes, which can coordinate with metal centers such as iridium and platinum to form highly efficient luminescent materials. Its advantage lies in the strong electron donating property of the phosphoryl group, which can adjust the central energy level of the metal and improve the luminescence efficiency of the device.

Technical details in industrial applications

 

1. Control of synthesis process parameters
Raw material ratio: When the molar ratio of phosphorus trichloride to isopropanol is 1:2.2, the esterification rate is the highest;
Catalyst selection: Weakly basic organic catalysts (such as pyridine) can accelerate the reaction, but the amount needs to be controlled to avoid side reactions;
Post processing steps: After deacidification of soda ash, it needs to be separated and purified by vacuum distillation (pressure<10mmHg), with a boiling point range of 72-75 ℃ (10mmHg).

 

2. Storage and safety regulations
Stability: Stable in dry air, but decomposes into phosphine (highly toxic) and phosphoric acid when in contact with water;
Incompatible substances: Strong oxidants (such as potassium permanganate) and strong acids (such as concentrated sulfuric acid) can cause violent reactions;
Protective measures: Wear a gas mask (EN149 standard), protective clothing (EN13034 standard), and chemical resistant gloves (made of nitrile rubber material) during operation.

In order to improve the yield and safety of diisopropyl phosphite, a continuous flow esterification process of diisopropyl phosphit was studied in a metal microchannel reactor using phosphorus trichloride and isopropanol as raw materials. The effects of deacidification conditions, solvent, material ratio, reaction residence time and reaction temperature on the reaction yield were investigated The optimum process results showed that the yield of diisopropyl phosphit could reach 91% when the total volume of reaction was 130 mL, the mass ratio of isopropanol to phosphorus trichloride was 3.7:1, the reaction temperature was 20 ℃, and the reaction residence time was 5 min Compared with the traditional production process, the metal microchannel reaction process improves the yield of diisopropyl phosphit, reduces the operation cost, and improves the production stability and safety.

The preparation method is to directly react isopropanol with phosphorus trichloride to obtain diisopropyl phosphite.

3(CH₃)₂CHOH+PCl₃→[(CH₃)₂CHO]₂POH+2HCl↑+(CH₃)₂CHCl

The isopropanol is continuously fed at a rate of 215 kg/h and phosphorus trichloride at a rate of 150 kg/h [the ratio is 3 ∶ 1 (mChemalbookol)]. After mixing, it reacts violently. The hydrogen chloride gas generated is quickly discharged from the mixing pot through vacuum mercury. The crude ester generated is heated in the falling film type swing plate deacidifier. The deacidification is further carried out. The deacidifier leaves at a temperature of 120~130 ℃ and is cooled to below 40 ℃. That is, the product with a content of 92%~95% is obtained, with a yield of 95%~98%.

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