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

3,4-Dihydroxy-3-cyclobutene-1,2-dione
3,4-Dihydroxy-3-cyclobutene-1,2-dione structure
CAS No.
2892-51-5
Chemical Name:
3,4-Dihydroxy-3-cyclobutene-1,2-dione
Synonyms
Squaric;2-dione;NSC 624671;SQUARC ACID;SQUARIC ACID;QUADRATIC ACID;TIMTEC-BB SBB007891;DIKETOCYCLOBUTENEDIOL;SQUARICACIDDIBUTYLESTERS;dihydroxy-cyclobutenedion
CBNumber:
CB6263069
Molecular Formula:
C4H2O4
Formula Weight:
114.06
MOL File:
2892-51-5.mol

3,4-Dihydroxy-3-cyclobutene-1,2-dione Properties

Melting point:
>300 °C(lit.)
Boiling point:
250.96°C
Density 
1.82 g/cm3
refractive index 
1.5800 (estimate)
Flash point:
190 °C
storage temp. 
-20°C
solubility 
20g/l
pka
1.5??(at 25℃)
form 
Crystalline Powder
color 
White to beige
PH
1 (1g/l, H2O, 20℃)
Water Solubility 
20 g/L (30 ºC)
Merck 
14,8769
BRN 
774275
CAS DataBase Reference
2892-51-5(CAS DataBase Reference)
NIST Chemistry Reference
3-Cyclobutene-1,2-dione, 3,4-dihydroxy-(2892-51-5)
EPA Substance Registry System
3-Cyclobutene-1, 2-dione, 3,4-dihydroxy-(2892-51-5)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xi
Risk Statements  36/37/38-43
Safety Statements  26-36-37/39
RIDADR  3261
WGK Germany  3
RTECS  GU1800000
Hazard Note  Irritant
TSCA  Yes
HazardClass  8
PackingGroup  II
HS Code  29144090
Symbol(GHS):
Signal word: Warning
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

3,4-Dihydroxy-3-cyclobutene-1,2-dione price More Price(12)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 123447 3,4-Dihydroxy-3-cyclobutene-1,2-dione 99% 2892-51-5 5g $48.4 2018-11-13 Buy
Sigma-Aldrich 123447 3,4-Dihydroxy-3-cyclobutene-1,2-dione 99% 2892-51-5 25g $149 2018-11-13 Buy
TCI Chemical D1399 3,4-Dihydroxy-3-cyclobutene-1,2-dione >98.0%(HPLC)(T) 2892-51-5 5g $56 2018-11-22 Buy
TCI Chemical D1399 3,4-Dihydroxy-3-cyclobutene-1,2-dione >98.0%(HPLC)(T) 2892-51-5 25g $168 2018-11-22 Buy
Alfa Aesar A15169 3,4-Dihydroxy-3-cyclobutene-1,2-dione, 98+% 2892-51-5 1g $18.3 2018-11-15 Buy

3,4-Dihydroxy-3-cyclobutene-1,2-dione Chemical Properties,Uses,Production

Chemical Properties

White powder

Uses

Squaric acid used as intermediate for squaraine dyes and heterocycles. Product Data Sheet

Definition

ChEBI: A carbon oxoacid that consists of 1,2-diketocyclobut-3-ene bearing two enolic hydroxy substituents at positions 3 and 4.

Purification Methods

Purify squaric acid by recrystallisation from H2O — this is quite simple because the acid is ~ 7% soluble in boiling H2O and only 2% at room temperature. It is not soluble in Me2CO or Et2O; hence it can be rinsed with these solvents and dried in air or a vacuum. It is not hygroscopic and gives an intense purple colour with FeCl3. It has IR max at 1820 (C=O) and 1640 (C=C) cm-1, and UV max at 269.5nm ( 37K M-1cm -1). [Cohn et al. J Am Chem Soc 81 3480 1959, Park et al. J Am Chem Soc 84 2919 1962] See also pKa values of 0.59 ±0.09 and 3.48 ±0.023 [Scwartz & Howard J Phys Chem 74 4374 1970]. [Schmidt & Reid Synthesis 869 1978, Beilstein 8 IV 2701.]

3,4-Dihydroxy-3-cyclobutene-1,2-dione Preparation Products And Raw materials

Raw materials

Preparation Products


3,4-Dihydroxy-3-cyclobutene-1,2-dione Suppliers

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View Lastest Price from 3,4-Dihydroxy-3-cyclobutene-1,2-dione manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-14 3,4-Dihydroxy-3-cyclobutene-1,2-dione
2892-51-5
US $7.00 / kg 1kg 99% 100kg career henan chemical co

3,4-Dihydroxy-3-cyclobutene-1,2-dione Spectrum


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