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Amberlyst® A21 Ion Exchange Resin

free base, 16-50 mesh

Synonym(s):

weak anion exhange resin (DMA)

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About This Item

MDL number:
MFCD00145842
UNSPSC Code:
23151817
NACRES:
SB.52

product name

Amberlyst® A21 free base, free base

vapor density

<1 (vs air)

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

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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

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

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Sigma-Aldrich

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Amberlyst A21: A reusable solid catalyst for green synthesis of pyran annulated heterocycles at room temperature.
Bihani, Manisha, et al.
Comptes Rendus Chimie, 16, 419-426 (2013)
Frederic Bonfils et al.
Organic & biomolecular chemistry, 4(3), 493-497 (2006-02-01)
The Michael reaction between methyl 1-oxoindan-2-carboxylate and methyl vinyl ketone was achieved successfully by pumping solutions of the reactants in toluene through a fluid bed of Amberlyst A21 at 50 degrees C. The use of a fluid bed reactor is
Transformation of Biomass Products into Fine Chemicals Catalyzed by Solid Lewis-and Br?nsted-acids.
Corma, Avelino, Michael Renz, and Manuel Susarte.
Topics in Catalysis, 52, 1182-1189 (2009)

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