3,4-二甲氧基-3-环丁烯-1,2-二酮

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.

MFCD00101316

C₆H₆O₄

142.10

53-56°

Keep Cold.

Crystalline powder

Very soluble in water.

36/37/38-42/43
Irritating to eyes, respiratory system and skin.May cause sensitization by inhalation and skin contact.

22-24-26-37-45
Do not breathe dust.Avoid contact with skin.In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).

 

否

  

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.

P284-P261-P280a-P305+P351+P338-P405-P501a
Wear respiratory protection.Avoid breathing dust/fume/gas/mist/vapours/spray.Wear protective gloves and eye/face protection.IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.Store locked up.Dispose of contents/container in accordance with local/regional/national/international regulations.