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339792

Sigma-Aldrich

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

98%

Synonyme(s) :

Dibutyl squarate

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About This Item

Formule linéaire :
[CH3(CH2)3O]2C4(=O)2
Numéro CAS:
2892-62-8
Poids moléculaire :
226.27
Numéro MDL:
MFCD00037150
Code UNSPSC :
12352100
ID de substance PubChem :
24860681
Nomenclature NACRES :
NA.22

Pureté

98%

Forme

liquid

Indice de réfraction

n20/D 1.494 (lit.)

Point d'ébullition

139 °C/0.5 mmHg (lit.)

Densité

1.047 g/mL at 25 °C (lit.)

Chaîne SMILES 

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

Clé InChI

XBRWELTXMQSEIN-UHFFFAOYSA-N

Catégories apparentées

Description générale

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.

Pictogrammes

Exclamation mark
GHS07

Mention d'avertissement

Warning

Mentions de danger

H315,H317,H319,H335

Classification des risques

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

Organes cibles

Respiratory system

Code de la classe de stockage

10 - Combustible liquids

Classe de danger pour l'eau (WGK)

WGK 3

Point d'éclair (°F)

235.4 °F - closed cup

Point d'éclair (°C)

113 °C - closed cup

Équipement de protection individuelle

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

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Aaron E Scott et al.
Toxicology and applied pharmacology, 183(1), 66-70 (2002-09-10)
The ability of chemical or pharmaceutical agents to induce allergic contact dermatitis (ACD) is of major health and regulatory concern. As such, tests to identify their sensitizing capacity, such as the guinea pig maximization test and the more recently developed
F Dall'oglio et al.
The Journal of dermatological treatment, 16(1), 10-14 (2005-05-18)
Severe alopecia areata (AA) may have a chronic relapsing course and is often resistant to current treatments. The aim of our study was to evaluate whether topical immunotherapy with squaric acid dibutylester (SADBE) is able to improve the course of
Kazumasa Morita et al.
The Journal of dermatology, 29(10), 661-664 (2002-11-16)
Topical immunotherapy is effective for severe alopecia areata. However, there are patients with alopecia areata refractory to topical immunotherapy alone. We tried SADBE (squaric acid dibutylester) topical immunotherapy combined with topical dry ice cryotherapy, carpronium chloride (a parasympathetic nerve stimulant)
C Ajith et al.
Journal of drugs in dermatology : JDD, 5(3), 262-266 (2006-04-01)
Immunotherapy with sqauric acid dibutyl ester (SADBE) is a well-accepted therapy for alopecia areata. To study efficacy, safety, and factors influencing the outcome in the treatment of alopecia areata. During a 4-year period, 70 patients of alopecia areata, unresponsive to
Rachid Marhaba et al.
Journal of immunology (Baltimore, Md. : 1950), 179(8), 5071-5081 (2007-10-04)
Induction of a chronic eczema is a most efficient therapy for alopecia areata (AA). We had noted a reduction in regulatory T cells during AA induction and wondered whether regulatory T cells may become recruited or expanded during repeated skin
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