1,2-Dichloro-1-cyclobutene-3,4-dione
[CAS# 2892-63-9]

Identification

• Name: 1,2-Dichloro-1-cyclobutene-3,4-dione
• Synonyms: Dichlorocyclobutenedione; Quadratic acid dichloride; Squaric acid dichloride; Squaryl dichloride
• Molecular Formula: C₄Cl₂O₂
• Molecular Weight: 150.95
• CAS Registry Number: 2892-63-9
• EC Number: 821-831-2

Properties

• Solubility: Soluble (35 g/L) (25 ºC), Calc.^*
• Density: 1.74±0.1 g/cm³ (20 ºC 760 Torr), Calc.^*
• Melting point: 51-52 ºC^**
• Boiling point: 175.6±50.0 ºC (760 Torr), Calc.^*
• Flash point: 66.0±30.7 ºC, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2013 ACD/Labs)

^** Maahs, Guenther; Justus Liebigs Annalen der Chemie 1965, V686, P55-63.

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Serious eye damage	Eye Dam.	1	H318
Specific target organ toxicity - single exposure	STOT SE	3	H335
Skin irritation	Skin Irrit.	2	H315
Acute toxicity	Acute Tox.	4	H302