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210145

Sigma-Aldrich

2,2-Dimethyl-1,3-dioxane-4,6-dione

98%

Synonym(s):

Malonic acid cyclic isopropylidene ester, Meldrum’s acid, cycl-Isopropylidene malonate

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About This Item

Empirical Formula (Hill Notation):
C6H8O4
CAS Number:
2033-24-1
Molecular Weight:
144.13
Beilstein:
117310
EC Number:
217-992-8
MDL number:
MFCD00006638
UNSPSC Code:
12352100
PubChem Substance ID:
24852618
NACRES:
NA.22

Assay

98%

form

solid

mp

92-96 °C (lit.)

solubility

dioxane: soluble 5%, clear to very slightly hazy, colorless to faintly yellow

storage temp.

2-8°C

SMILES string

CC1(C)OC(=O)CC(=O)O1

InChI

1S/C6H8O4/c1-6(2)9-4(7)3-5(8)10-6/h3H2,1-2H3

InChI key

GXHFUVWIGNLZSC-UHFFFAOYSA-N

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General description

2,2-Dimethyl-1,3-dioxane-4,6-dione (Meldrum′s acid) is widely used in organic synthesis, especially for multiple C-C bond formations due to its adequate acidity (pKa 4.83) and steric rigidity. Knoevenagel condensation reaction between aldehydes and Meldrum′s acid are accelerated in ionic liquids.

Meldrum′s acid is used as a valuable starting material to synthesize heterocycles and as intermediates in organic synthesis reactions.

Application

2,2-Dimethyl-1,3-dioxane-4,6-dione was used in the synthesis of:
  • macrocyclic β-keto lactone
  • 4-pyridyl-substituted heterocycles
  • 2-substituted indoles
  • isofraxidin.

Storage Class Code

11 - Combustible Solids

WGK

WGK 2

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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The synthesis of β-keto lactones via cyclization of β-keto ester dianions or the cyclization of Meldrum's acid derivatives.
Lermer L, et al.
Canadian Journal of Chemistry, 70(5), 1427-1445 (1992)
Davood Nematollahi et al.
Chemical & pharmaceutical bulletin, 58(1), 23-26 (2010-01-05)
Electrochemical oxidation of catechols in the presence of phenyl-Meldrum's acid as a nucleophile in aqueous solution has been studied in detail by means of cyclic voltammetry and controlled potential coulometry. The results indicate that the o-benzoquinone derived from catechols participates
Songlei Zhu et al.
Molecules (Basel, Switzerland), 17(12), 13856-13863 (2012-11-24)
A series of 4-aryl-6-methyl-3,4-dihydro-2H-pyrano[3,2-c]quinolin-2,5(6H)-diones were synthesized via the three-component reactions of aromatic aldehydes, 4-hydroxy-1-methylquinolin-2(1H)-one, and Meldrum's acid catalyzed by L-proline. The structures of the products were identified by spectroscopic analysis. A mechanism for this three-component reaction catalyzed by L-proline was
New multicomponent domino reactions (MDRs) in water: highly chemo-, regio-and stereoselective synthesis of spiro {[1, 3] dioxanopyridine}-4, 6-diones and pyrazolo [3, 4-b] pyridines.
Ma N, et al.
Green Chemistry, 12?(8), 1357-1361 (2010)
Characterization of Meldrum?s acid derivative 5-(5-Ethyl-1, 3, 4-thiadiazol-2-ylamino) methylene-2, 2-dimethyl-1, 3-dioxane-4, 6-dione by Raman and FT-IR spectroscopy and DFT calculations
De Toledo TA, et al.
Journal of Molecular Structure, 37-42, 1091-1091 (2015)
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Articles

Knoevenagel Condensation Reaction

Knoevenagel Condensation is an organic reaction named after Emil Knoevenagel. It is a classic C-C bond formation reaction and a modification of the Aldol Condensation.

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