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377406

Sigma-Aldrich

3,4-Dimethoxy-3-cyclobutene-1,2-dione

99%

Synonym(s):

Dimethyl squarate

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About This Item

Linear Formula:
(CH3O)2C4(=O)2
CAS Number:
5222-73-1
Molecular Weight:
142.11
MDL number:
MFCD00101316
UNSPSC Code:
12352100
PubChem Substance ID:
24863502
NACRES:
NA.22

Quality Level

100

assay

99%

form

solid

mp

55-57 °C (lit.)

functional group

ether
ketone

storage temp.

2-8°C

SMILES string

COC1=C(OC)C(=O)C1=O

InChI

1S/C6H6O4/c1-9-5-3(7)4(8)6(5)10-2/h1-2H3

InChI key

SZBNZTGCAMLMJY-UHFFFAOYSA-N

Related Categories

General description

3,4-Dimethoxy-3-cyclobutene-1,2-dione (Dimethyl squarate) is a cyclobutene derivative. It reacts with hydroxylamine derivatives to afford 3-hydroxyamino-4-methoxy-3-cyclobutene-1,2-diones.

Application

3,4-Dimethoxy-3-cyclobutene-1,2-dione (Dimethyl squarate) may be used in the synthesis of the following compounds:
  • chiral squaramides, highly enantioselective catalyst for the Friedel-Crafts reactions of indoles
  • 3-(hydroxyamino)-4-methoxy-3-cyclobutene-1,2-dione
  • squarate derivatives of the O-SP-core antigens
  • methyl squarate derivative of the Ogawa O-SP-core antigen
  • o-quinodimethanes
  • benzocyclobutenes
  • quinones

pictograms

Health hazard
GHS08

signalword

Danger

hcodes

H317,H334

Hazard Classifications

Resp. Sens. 1 - Skin Sens. 1

Storage Class

11 - Combustible Solids

wgk_germany

WGK 3

ppe

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
MKCQ0903
MKCF5357
MKBR4150V
MKBK0489V
MKBB0097V

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Peng Xu et al.
Bioconjugate chemistry, 22(10), 2179-2185 (2011-09-09)
Bacterial O-SP-core antigens can be conjugated to proteins in the same, simple way as synthetic, linker-equipped carbohydrates by applying squaric acid chemistry. Introduction of spacers (linkers) to either O-SP-core antigens or protein carriers, which is involved in commonly applied protocols
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Hydroxylamin-Derivate der Quadratsaure.
Zinner G, et al.
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The Journal of Organic Chemistry, 57, 6896-6896 (1992)
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