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339792

Sigma-Aldrich

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

98%

Sinónimos:

Dibutyl squarate

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About This Item

Fórmula lineal:
[CH3(CH2)3O]2C4(=O)2
Número de CAS:
2892-62-8
Peso molecular:
226.27
MDL number:
MFCD00037150
UNSPSC Code:
12352100
PubChem Substance ID:
24860681
NACRES:
NA.22

Quality Level

200

assay

98%

form

liquid

refractive index

n20/D 1.494 (lit.)

bp

139 °C/0.5 mmHg (lit.)

density

1.047 g/mL at 25 °C (lit.)

SMILES string

CCCCOC1=C(OCCCC)C(=O)C1=O

InChI

1S/C12H18O4/c1-3-5-7-15-11-9(13)10(14)12(11)16-8-6-4-2/h3-8H2,1-2H3

InChI key

XBRWELTXMQSEIN-UHFFFAOYSA-N

Categorías relacionadas

General description

3,4-Dibutoxy-3-cyclobutene-1,2-dione is the dialkyl ester of squaric acid.

Application

3,4-Dibutoxy-3-cyclobutene-1,2-dione was used in the synthesis of novel semisquarylium dye, useful for highly selective Hg2+ sensing in aqueous media. It was also employed in the synthesis of 3-butoxy-4-(1,3,3-trimethyl-2,3-dihydro-1H-2-indolylidenemethyl)-3-cyclobutene-1,2-dione, intermediate for the synthesis of squaryl dyes.

pictograms

Exclamation mark
GHS07

signalword

Warning

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - Skin Sens. 1 - STOT SE 3

target_organs

Respiratory system

Storage Class

10 - Combustible liquids

wgk_germany

WGK 3

flash_point_f

235.4 °F - closed cup

flash_point_c

113 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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A 57-year-old Japanese male patient with an 18-year history of discoid lupus erythematosus (DLE) presented with alopecia on his scalp, and was clinically diagnosed to have alopecia areata. He was started on topical immunotherapy with squaric acid dibutylester (SADBE) for
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