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Diethyl squarate

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Diethyl squarate Basic information

Product Name:
Diethyl squarate
Synonyms:
  • 3,4-DIETHOXYCYCLOBUTANE-1,2-DIONE
  • Diethyl squarate, Squaric acid diethyl ester
  • SQUARIC ACID DIETHYL ESTER,(DIETHYL SQUARATE, 3,4-DIETHOXY-3-CYCLOBUTENE-1,2-DIONE)
  • DIETHOXYCYCLOBUTENEDIONE
  • 3,4-DIETHOXY-3-CYCLOBUTENE-1,2-DIONE 98%
  • SQUARICACIDDIETHYLESTER/3,4-DIETHOXY-3-CYCLOBUTENE-1,2-DIONE
  • 3,4-Diethoxy-3-cyclobuten-1,2-dion
  • Diethyl quadratate
CAS:
5231-87-8
MF:
C8H10O4
MW:
170.16
Product Categories:
  • Cyclobutanes & Cyclobutenes
  • Simple 4-Membered Ring Compounds
  • Ring Systems
  • Aluminium foil bag/Fluoride bottle or on your request
Mol File:
5231-87-8.mol
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Diethyl squarate Chemical Properties

Melting point:
13-18 °C
Boiling point:
95 °C0.1 mm Hg(lit.)
Density 
1.15 g/mL at 25 °C(lit.)
refractive index 
n20/D 1.509(lit.)
Flash point:
>230 °F
storage temp. 
2-8°C
form 
Liquid
color 
Clear yellow to light brownish
Water Solubility 
insoluble
BRN 
640626
InChIKey
DFSFLZCLKYZYRD-UHFFFAOYSA-N
CAS DataBase Reference
5231-87-8(CAS DataBase Reference)
NIST Chemistry Reference
3,4-Diethoxy-3-cyclobutene-1,2-dione(5231-87-8)
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Safety Information

Hazard Codes 
Xn,Xi
Risk Statements 
36/37/38-42/43
Safety Statements 
7-26-37/39-24-23
WGK Germany 
3
RTECS 
GU1772466
10
Hazard Note 
Irritant
HS Code 
29145090

MSDS

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Diethyl squarate Usage And Synthesis

Chemical Properties

clear yellow to light brownish liquid

Uses

3,4-Dethoxy-3-cyclobutene-1,2-dione is used as a starting material for synthesis of furanones and quinones. It undergoes ethoxy substitution with amines and unsaturated organosilanes.

Uses

Diethyl squarate is an intermediate for pharma products, for photochemicals used in the dry-view process, in synthesis of photosensitive squaraine dyes (eg. laser dyes used in CD-Rom) and as intermediate for functional polymers.

General Description

The reaction of 3,4-diethoxy-3-cyclobutene-1,2-dione (squaric acid diethyl ester) with glycosylamines (formed by reducing oligosaccharides) was studied. The derivatives formed were linked to amino-functionalized lipids, solids or proteins.

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