Propenal dimethyl acetal
Acrolein dimethyl acetal
CAS: 6044-68-4
Molecular Formula: C5H10O2
Propenal dimethyl acetal - Names and Identifiers
Propenal dimethyl acetal - Physico-chemical Properties
| Molecular Formula | C5H10O2 | ||||||||||||
| Molar Mass | 102.13 | ||||||||||||
| Density | 0.862g/mLat 25°C(lit.) | ||||||||||||
| Boling Point | 89-90°C(lit.) | ||||||||||||
| Flash Point | 27°F | ||||||||||||
| Vapor Presure | 65.961mmHg at 25°C | ||||||||||||
| Appearance | clear liquid | ||||||||||||
| Color | Colorless to Almost colorless | ||||||||||||
| BRN | 1700037 | ||||||||||||
| Storage Condition | 2-8°C | ||||||||||||
| Refractive Index | n20/D 1.395(lit.) | ||||||||||||
| Physical and Chemical Properties |
|
Propenal dimethyl acetal - Risk and Safety
| Hazard Symbols | F - Flammable |
| Risk Codes | 11 - Highly Flammable |
| Safety Description | S16 - Keep away from sources of ignition. S23 - Do not breathe vapour. S24/25 - Avoid contact with skin and eyes. S29 - Do not empty into drains. S33 - Take precautionary measures against static discharges. |
| UN IDs | UN 3384 6.1/PG 1 |
| WGK Germany | 3 |
| RTECS | UC8500000 |
| Hazard Class | 3.1 |
| Packing Group | II |
Propenal dimethyl acetal - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| use | acrylaldehyde dimethyl acetal is an acetal. as a reaction intermediate, acetal is increasingly used in the synthesis of pharmaceuticals, pesticides, fragrances, resins, etc. The general method for preparing acrolein dimethyl acetal and acrolein diethyl acetal is to dehydrate and condensation acrolein with methanol or ethanol under the action of an acidic catalyst. However, due to the active nature of acrolein, it is unstable in acidic medium, and because the steric hindrance effect of the structure is not obvious, the selectivity of reacting with methanol and ethanol to generate acetal is low, there are many side reactions, and the purification is difficult, which is not conducive to industrial production. CN201110201192.9 reported the reaction of acrolein with trimethyl orthoformate or triethyl orthoformate under acidic catalyst conditions. Because the steric hindrance effect of orthoformate in the reaction is greater than that of methanol and ethanol, the reaction generates corresponding acetals, with high selectivity, few side reactions, easy purification and suitable for industrial production. The method is as follows: a 500ml three-mouth flask equipped with a stirring device, a dropping funnel and a thermometer is placed in a water bath, 280g of trimethyl orthoformate (2.64mol) is added, stirring is started, 1.8g(0.019mol) of sulfamic acid is slowly added, the temperature is controlled by a water bath device at 30-40 ℃, 140g(2.54mol) of acrolein is added dropwise at a constant speed, the dripping is completed within 1 hour, stirring is continued for 2 hours, and then sodium, neutralize to PH7 -7.5, stir for another 2 hours, stand for 4 hours, filter, remove insoluble solids, carry out atmospheric distillation operation, intercept 89-91 ℃ fraction 201g(GC detection, content 98.8%), that is, acrylaldehyde dimethyl acetal, the yield is 81.8%. |
Last Update：2024-04-10 22:29:15
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