Amberlyst® A21 free base
ALDRICH/216410 - free base
Synonym: weak anion exhange resin (DMA)
MDL Number: MFCD00145842
Product Type: Chemical
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ATR-IR Spectra for Amberlyst® A21 free base.
| autoignition temp. | 800 °F |
| capacity | 1.3 meq/mL by wetted bed volume |
| form | beads |
| matrix | styrene divinylbenzene (macroporous) |
| matrix active group | dimethylamino |
| moisture | 56-62% |
| particle size | 22-30 mesh |
| 490-690 μm | |
| Quality Level | 100  |
| separation technique | anion exchange |
| technique(s) | LPLC: suitable |
| vapor density | <1 (vs air) |
| vapor pressure | 17 mmHg ( 20 °C) |
| Application: | Amberlyst® A21 free base was used in catalyst preparation. |
| Features and Benefits: | Weakly basic, macroreticular resin with alkyl amine functionality. |
| General description: | Amberlyst A21 is a neutral ion-exchange resin and a solid base which catalyses three-component reaction of aldehyde and malononitrile with various active methylene compounds to synthesize a range of pyran annulated heterocycles. Use of the solid base is to generate a highly green protocol by eliminating chromatographic purification involving hazardous organic solvents, and for easy recovery and reusability of the catalyst. Amberlyst A21 is used as a fluid bed resin. Fluid bed reactor allows gel-type beads, of polymer-supported (PS) organic reactions, to be used in a flow system. The Michael reaction between methyl 1-oxoindan-2-carboxylate and methyl vinyl ketone in toluene can be attained through a fluid bed of Amberlyst A21 at 50°C. |
| Legal Information: | Amberlyst is a registered trademark of The Dow Chemical Company or an affiliated company of Dow |
| Packaging: | 1 kg in poly bottle |
| Packaging: | 5, 250 g in poly bottle |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 3 |
| Flash Point(F) | Not applicable |
| Flash Point(C) | Not applicable |
| UNSPSC | 23151817 |