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5222-73-1 - 3,4-Dimethoxy-3-cyclobutene-1,2-dione, 98% - Dimethyl squarate - Squaric acid dimethyl ester - A18186 - Alfa Aesar

A18186 3,4-Dimethoxy-3-cyclobutene-1,2-dione, 98%

Numéro CAS
Dimethyl squarate
Squaric acid dimethyl ester

Dimensions Prix ($) Quantité Disponibilité
1g 46,20
5g 156,00
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3,4-Dimethoxy-3-cyclobutene-1,2-dione, 98%


Propriétés chimiques

Poids formulaire
Point de fusion
Very soluble in water.


3,4-Dimethoxy-3-cyclobutene-1,2-dione (Dimethyl squarate) finds it uses in the synthesis of 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. It is employed as a starting material in the preparation of o-quinodimethanes, benzocyclobutenes, and quinones.


Store away from oxidizing agents. Keep the container tightly closed and place it in a cool, dry and well ventilated condition.

Références bibliographiques

Yong Qian.; Gaoyuan Ma.; Aifeng Lv.; Hai-Liang Zhu.; Jing Zhao.; Viresh H Rawal. Squaramide-catalyzed enantioselective Friedel-Crafts reaction of indoles with imines.Chem Commun (Camb).2010,46(17), 3004-3006.

M Burak Onaran.; Anthony B Comeau.; Christopher T Seto. Squaric acid-based peptidic inhibitors of matrix metalloprotease-1.J Org Chem.2005,70(26), 10792-10802.

Mentions de danger et de prudence du SGH

Mentions de danger (UE): H315-H319-H334-H317-H335

Causes skin irritation. Causes serious eye irritation. May cause allergy or asthma symptoms or breathing difficulties if inhaled. May cause an allergic skin reaction. May cause respiratory irritation.

Mentions de prudence: P260u-P201-P280a-P303+P361+P353-P305+P351+P338-P301+P330+P331-P304+P340-P310a-P405-P501a

Obtain special instructions before use. Wear protective gloves and eye/face protection. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Autres références

Code tarifaire harmonisé


Consulté récemment

Produits chimiques

Sciences de la vie

Métaux et matériaux


Analytique et matériel de laboratoire