The Diethyl ethylphosphonate with CAS registry number of 78-38-6 is also known as Phosphonic acid,P-ethyl-, diethyl ester. The IUPAC name is 1-[Ethoxy(ethyl)phosphoryl]oxyethane. Its EINECS registry number is 201-111-9. In addition, the formula is C₆H₁₅O₃P and the molecular weight is 166.16. This chemcial is a colorless liquid with a mild odor and it is used as efficient organic phosphorus flame retardant which can be added extensively in a variety of rigid foam.

Physical properties about Diethyl ethylphosphonate are: (1)ACD/LogP: 0.82; (2)ACD/LogD (pH 5.5): 0.82; (3)ACD/LogD (pH 7.4): 0.82; (4)ACD/BCF (pH 5.5): 2.46; (5)ACD/BCF (pH 7.4): 2.46; (6)ACD/KOC (pH 5.5): 66.29; (7)ACD/KOC (pH 7.4): 66.29; (8)#H bond acceptors: 3; (9)#Freely Rotating Bonds: 5; (10)Index of Refraction: 1.403; (11)Molar Refractivity: 40.21 cm³; (12)Molar Volume: 164.4 cm³; (13)Surface Tension: 29.2 dyne/cm; (14)Density: 1.01 g/cm³; (15)Flash Point: 92.7 °C; (16)Enthalpy of Vaporization: 41.64 kJ/mol; (17)Boiling Point: 198 °C at 760 mmHg; (18)Vapour Pressure: 0.518 mmHg at 25 °C.

Preparation of Diethyl ethylphosphonate. Firstly, ethanol, methyl red are mixed with solvent and the mixture is added to the reactor. Then ammonia is passed into the reaction solution under stirring at the temperature of 0 °C. Dropping phosphorus trichloride slowly at the same time. The reaction needs 2-3 hours with the reaction temperature of 0-10 °C. Secondly, the reaction mixture is dissolved in water. After solvent recovery by vacuum distillation, the reservoir is vacuum distillated to collect triethyl phosphite at 52-53 °C with the yield of 70-75%. At last, product is obtained by isomerization reaction with catalyst.

When you are using this chemical, please be cautious about it. As a chemical, it is irritating to eyes, respiratory system and skin. During using it, wear suitable gloves and eye/face protection. If contact with eyes accidently, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
1. Canonical SMILES: CCOP(=O)(CC)OCC
2. InChI: InChI=1S/C6H15O3P/c1-4-8-10(7,6-3)9-5-2/h4-6H2,1-3H3
3. InChIKey: AATNZNJRDOVKDD-UHFFFAOYSA-N

The toxicity data is as follows: