563-79-1 - Names and IdentifiersName2,3-Dimethyl-2-buteneSynonymsBISOMER DMB 2Tetramethylethene
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| Name | 2,3-Dimethyl-2-butene |
| Synonyms | BISOMER DMB 2 Tetramethylethene Tetramethylethylene TETRAMETHYLETHYLENE 2,3-Dimethylbutene-2 2,3-Dimethyl-2-butene 2,3-DIMETHYL-2-BUTENE 2,3-Dimethylbut-2-ene 2,3-dimethyl-but-2-ene 2,3-DIMETHYL-2-BUTENE, STAB. 2,3-DIMETHYL-2-BUTENE, 1.0M SOLUTION IN TETRAHYDROFURAN |
| CAS | 563-79-1 |
| EINECS | 209-263-8 |
| InChI | InChI=1/C6H12/c1-5(2)6(3)4/h1-4H3 |
| Molecular Formula | C6H12 |
| Molar Mass | 84.16 |
| Density | 0.708 g/mL at 25 °C (lit.) |
| Melting Point | -75 °C (lit.) |
| Boling Point | 73 °C (lit.) |
| Flash Point | 2°F |
| Water Solubility | Soluble in water (0.071 g/L) |
| Solubility | 0.071g/l |
| Vapor Presure | 215 mm Hg ( 37.7 °C) |
| Appearance | Liquid |
| Specific Gravity | 0.708 |
| Color | Clear colorless to slightly yellow |
| BRN | 1361357 |
| Storage Condition | 2-8°C |
| Stability | Stable. Highly flammable - readily forms explosive mixtures with air. Note low flash point. Incompatible with strong acids, strong oxidizing agents, peroxy compounds. |
| Sensitive | Air Sensitive |
| Explosive Limit | 1.2%(V) |
| Refractive Index | n20/D 1.412(lit.) |
| Physical and Chemical Properties | Tetramethyl ethylene is an opaque liquid, M.P.-75 ℃, B. P. 73 ℃,n20D 1.4120, relative density 0.708,f. P. 2 F (-16 C), easy to burn, long-term contact with air is easy to be oxidized, insoluble in water, soluble in benzene, toluene, ethanol and other organic solvents. |
| Use | For the production of chrysanthemum acid, spices |
| Risk Codes | R11 - Highly Flammable R65 - Harmful: May cause lung damage if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R22 - Harmful if swallowed R19 - May form explosive peroxides R40 - Limited evidence of a carcinogenic effect R36/37 - Irritating to eyes and respiratory system. |
| Safety Description | S16 - Keep away from sources of ignition. S33 - Take precautionary measures against static discharges. S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. S9 - Keep container in a well-ventilated place. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | UN 3295 3/PG 2 |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 10-23 |
| TSCA | Yes |
| HS Code | 29012980 |
| Hazard Note | Extremely Flammable/Corrosive/Harmful |
| Hazard Class | 3 |
| Packing Group | II |
| introduction | 2, 3-dimethyl-2-butene is a hydrocarbon organic substance and can be used as an intermediate for pesticides and fragrances. At the same time, it is also used for the production of spices and other agricultural chemicals, especially the use of it instead of new hexene to produce tona musk spices, which has the advantages of low cost and stable product quality. |
| Use | Tetramethylethylene, namely 2,3-dimethylbutene-2, is an intermediate of pyrethroid fenpropathrin. The intermediate of pesticides and spices is the main raw material for the synthesis of chrysanthemum acid. At the same time, it is also used for the production of spices and other agricultural chemicals, especially the use of it instead of new hexene to produce tona musk spices, which has the advantages of low cost and stable product quality. the raw material of agrochemical cyanuric acid pharmaceutical intermediates, used in the production of new diabetic drugs naglide used in the production of chrysanthemum acid and spices |
| production method | tetramethyl ethylene is obtained by dimerization of propylene. propylene is put into a dimerization kettle, a homogeneous catalyst is added, and catalytic polymerization is carried out under stirring. when the pressure in the kettle drops below 0.01MPa, the reaction of the material is stopped and the oil layer is crude steamed, remove the products of trimer and tetramer, namely C9 ~ C19. Olefins, collect the fraction at 53~75 ℃ as a crude product, which is mainly 2, 3-dimethylbutene-1, and then carry out catalytic isomerization, the reaction temperature is controlled at 85~90 ℃, so that the product is transformed into 2, 3-dimethylbutene-2, namely tetramethylbutene-2, and then carry out rectification to collect the fraction at 71~74 ℃, namely the finished product 2, 3-Dimethylbutene-2, the rest are other by-products C6 olefins. In the dimerization reaction, the one-way conversion rate of propylene is> 90%, the dimerization selectivity is 80%, and the isomerization conversion rate is 79%. |
| spontaneous combustion temperature | 754 °F |
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