216410

Amberlyst^® A21 Ion Exchange Resin

free base, 16-50 mesh

• Synonym(s): weak anion exhange resin (DMA)
• MDL number: MFCD00145842
• UNSPSC Code: 23151817
• NACRES: SB.52

Properties

• product name: Amberlyst^® A21 free base, free base
• vapor density: <1 (vs air)
• Quality Level: 100
• vapor pressure: 17 mmHg ( 20 °C)
• form: beads
• autoignition temp.: 800 °F
• moisture: 56-62%
• technique(s): LPLC: suitable
• matrix: styrene divinylbenzene (macroporous)
• matrix active group: dimethylamino
• particle size: 22-30 mesh; 490-690 μm
• capacity: 1.3 meq/mL by wetted bed volume
• separation technique: anion exchange

Description

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.

Application

Amberlyst^® A21 free base was used in catalyst preparation.

Features and Benefits

Weakly basic, macroreticular resin with alkyl amine functionality.

Legal Information

Amberlyst is a registered trademark of The Dow Chemical Company or an affiliated company of Dow

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves